Functions (Edexcel A Level Maths: Pure): Exam Questions

5 hours50 questions
13 marks

(i) Sketch the graph of y equals open vertical bar x close vertical bar plus 3.

(ii) Explain why open vertical bar x close vertical bar plus 3 greater or equal than open vertical bar x plus 3 close vertical bar for all real values of x.

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21 mark

The point P left parenthesis negative 2 comma negative 5 right parenthesis lies on the curve with equation y equals straight f left parenthesis x right parenthesis comma space space x element of straight real numbers

Find the point to which P is mapped, when the curve with equation y equals straight f left parenthesis x right parenthesis is transformed to the curve with equation

y equals vertical line straight f left parenthesis x right parenthesis vertical line

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3
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4 marks

State whether the following mappings are one-to-one, many-to-one, one-to-many or many-to-many.

 

(i) straight f colon space x rightwards arrow from bar 4 x minus 2

(ii) straight f colon space x rightwards arrow from bar x squared

(iii) straight f colon space x rightwards arrow from bar x over 4

(iv) straight f colon space x rightwards arrow from bar square root of x

 

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4
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3 marks

State the largest possible domains for the following functions.

(i) straight f colon space x rightwards arrow from bar square root of x

(ii) straight f colon space x rightwards arrow from bar ln left parenthesis x minus 2 right parenthesis

(iii) straight f colon space x rightwards arrow from bar arcsin space x

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5
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3 marks

State the range for the following functions based on the given domains.

(i) straight f colon space x rightwards arrow from bar e to the power of x               x element of straight real numbers

(ii) straight f colon space x rightwards arrow from bar x squared space plus space 1        x element of straight real numbers

(iii) straight f colon space x rightwards arrow from bar 1 over x               x element of straight real numbers

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6a
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3 marks

The function f(x) is defined as

straight f left parenthesis x right parenthesis space equals space x to the power of 2 space end exponent minus space 8 x space minus space 20 space space space space space space space space space space x element of straight real numbers

Sketch the graph of y = f(x), giving the coordinates of any points where the graph intersects the coordinate axes.

6b
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2 marks

The minimum point on the graph of y = f(x) has x -coordinate 4. Find the range of f(x) .

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7
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3 marks

The function f(x)  is defined as

straight f left parenthesis x right parenthesis space equals space x squared space space minus space space 9 space space space space space space space space space space x space greater or equal than space 3   

(i) Work out the range of f(x).

(ii) If the domain of f(x) is changed to x space greater or equal than space 0 comma what would be the new range of f(x)?

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8a
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4 marks

The functions f(x) and g(x) are defined as follows

 straight f left parenthesis x right parenthesis space equals space 3 x space plus space 5 space space space space space space space space space space x element of straight real numbers

g left parenthesis x right parenthesis space equals space minus 2 x space space space space space space space space space space space space space space space x element of straight real numbers space

Find

(i) fg(x)   

(ii) gf(x

 

8b
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2 marks

Solve the equation f(x) = g(x) .

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9a
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3 marks

The function f(x) is defined by

 straight f left parenthesis x right parenthesis space equals space 3 x squared space plus space 1 space space space space space space space space space space straight x element of straight real numbers

Find the inverse of f(x) , f−1(x).

9b
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2 marks

Find the domain and range for f-−1(x).

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10a
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3 marks

Solve the equation vertical line 6 minus 2 x vertical line space equals space 4.

10b
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4 marks

On the same diagram, sketch the graphs of y space equals space vertical line 6 minus 2 x vertical line and y space equals space 4.
Label the coordinates of the points where the two graphs intersect each other and the coordinate axes.

10c
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3 marks

Consider the graphs of y space equals vertical line 6 minus 2 x vertical line and y equals k, where k is a constant.
For which values of  k...

(i) ... will the two graphs have no points of intersection?

(ii) ... will the two graphs have one point of intersection?

(iii) ... will the two graphs have two points of intersection?

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14 marks

In this question you must show all stages of your working.

Solutions relying entirely on calculator technology are not acceptable.

Graph of the equation y = |3 - 2x|, forming a V shape that touches the x-axis at one point where x>0.
Figure 1

Figure 1 shows a sketch of the graph with equation y equals open vertical bar 3 minus 2 x close vertical bar

Solve

open vertical bar 3 minus 2 x close vertical bar equals 7 plus x

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2a2 marks

straight g open parentheses x close parentheses equals fraction numerator 2 x plus 5 over denominator x minus 3 end fraction space space space space space x greater or equal than 5

Find gg open parentheses 5 close parentheses.

2b1 mark

State the range of straight g.

2c3 marks

Find straight g to the power of negative 1 end exponent open parentheses x close parentheses, stating its domain.

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3a1 mark

The functions straight f and straight g are defined by

table row cell straight f open parentheses x close parentheses equals 7 minus 2 x squared end cell blank cell x element of straight real numbers end cell blank blank row cell straight g open parentheses x close parentheses equals fraction numerator 3 x over denominator 5 x minus 1 end fraction end cell blank cell x element of straight real numbers end cell blank cell x not equal to 1 fifth end cell end table

State the range of straight f

3b1 mark

Find gf open parentheses 1.8 close parentheses

3c
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2 marks

Find straight g to the power of negative 1 end exponent open parentheses x close parentheses

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4a2 marks

The function straight f is defined by

straight f open parentheses x close parentheses equals fraction numerator 3 x minus 7 over denominator x minus 2 end fraction space space space space space space space space x element of straight real numbers comma space space x not equal to 2

Find straight f to the power of negative 1 end exponent open parentheses 7 close parentheses.

4b3 marks

Show that ff open parentheses x close parentheses equals fraction numerator a x plus b over denominator x minus 3 end fraction where a and b are integers to be found.

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5a3 marks

table row cell straight f open parentheses x close parentheses equals 2 x squared plus 4 x plus 9 end cell blank cell x element of straight real numbers end cell end table

Write straight f open parentheses x close parentheses in the form a open parentheses x plus b close parentheses squared plus c, where a comma space b and c are integers to be found.

5b3 marks

Sketch the curve with equation y equals straight f open parentheses x close parentheses showing any points of intersection with the coordinate axes and the coordinates of any turning point.

5c2 marks

Find the range of the function

table row cell straight h open parentheses x close parentheses equals fraction numerator 21 over denominator 2 x squared plus 4 x plus 9 end fraction end cell blank cell x element of straight real numbers end cell end table

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6
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4 marks

State whether the following mappings are one-to-one, many-to-one, one-to-many or many-to-many.

(i)      straight f colon space x rightwards arrow from bar x squared

(ii)     straight f colon space x rightwards arrow from bar 3 x space plus space 1 space

(iii)    straight f colon space x rightwards arrow from bar left parenthesis x space plus space 1 right parenthesis cubed

(iv) straight f colon space x rightwards arrow from bar space plus-or-minus space square root of x

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7a
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3 marks

The function f(x) is defined as

straight f left parenthesis x right parenthesis space equals space x to the power of 2 space end exponent plus space 2 x space minus space 3 space space space space space space space space space space x element of straight real numbers

Sketch the graph of y = f(x) , giving the coordinates of any points where the graph intercepts the coordinate axes and the coordinates of the turning point.

7b
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1 mark

Write down the range of f(x) .

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8a
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2 marks

The function f(x) is defined as

straight f left parenthesis x right parenthesis space equals space x squared space minus space 4 space space space space space space space space space space x greater or equal than 0                         

Work out the range of  f(x) .

 

8b
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1 mark

If the domain of f(x) is changed to x less or equal than 0 comma what is the range of f(x)?

 

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9a
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1 mark

The functions f(x) and g(x) are defined as follows

straight f left parenthesis x right parenthesis space equals space x squared space space space space space space space space space space space space space space space space space space space x element of straight real numbers

straight g left parenthesis x right parenthesis space equals space 4 x space minus space 3 space space space space space space space space space space x element of straight real numbers           

Write down the range of f(x) .

 

9b
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4 marks

Find

(i)      left parenthesis f ring operator g right parenthesis left parenthesis x right parenthesis

(ii) left parenthesis g ring operator f right parenthesis left parenthesis x right parenthesis

9c
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2 marks

Solve the equation f(x) = g(x).

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10a
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3 marks

The graph of y = f(x) is shown below.

 

2-8-m-q5-edexcel-al-maths-pure

(i)       Use the graph to write down the domain and range of f(x).
(ii)      Given that the point (1, 1) lies on the dotted line, write down the equation of the line.

10b
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2 marks

On the diagram above sketch the graph of y = f −1(x).

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11a
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3 marks

On the same axes, sketch the graphs of  y = f(x) and y space equals space vertical line g left parenthesis x right parenthesis vertical line  where

straight f left parenthesis x right parenthesis space equals space left parenthesis x space plus space 2 right parenthesis squared space space space space space space space space space space x element of straight real numbers

 g left parenthesis x right parenthesis space equals space 2 x space plus space 4 space space space space space space space space space space space x element of straight real numbers

Label the points at which the graphs intersect the coordinate axes.

11b
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2 marks

Solve the equation straight f left parenthesis x right parenthesis space equals space vertical line g left parenthesis x right parenthesis vertical line.

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12a
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2 marks

The function f(x) is defined as

straight f colon space x space rightwards arrow from bar space fraction numerator x squared plus 1 over denominator x squared end fraction space space space space space space space space space space x element of straight real numbers comma space x space not equal to space 0

 Show that f(x) can be written in the form

 straight f colon space x space rightwards arrow from bar space 1 space plus space 1 over x squared

                             

12b
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2 marks

Explain why the inverse of f(x) does not exist and suggest an adaption to its domain so the inverse does exist.

12c
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4 marks

The domain of f(x) is changed to x > 0.
Find an expression for f−1(x)  and state its domain and range.

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13
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3 marks

Solve the equation  vertical line 4 x space plus space 2 vertical line space equals space 5.

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14a
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3 marks

The functions f(x) and  g(x)  are defined as follows

straight f left parenthesis x right parenthesis space equals space 1 half space left parenthesis 4 x space minus space 3 right parenthesis space space space space space space space space space space x element of straight real numbers

g left parenthesis x right parenthesis space equals space 0.5 x space plus space 0.75 space space space space space space space space space x element of straight real numbers

Find

(i) straight f g left parenthesis x right parenthesis

(ii) g straight f left parenthesis x right parenthesis

14b
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3 marks

Write down f−1(x) and state its domain and range.

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15a
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4 marks

The functions f(x), g(x) are defined as follows

straight f left parenthesis x right parenthesis space equals space vertical line x minus 9 vertical line space space space space space space space space space space x element of straight real numbers

g left parenthesis x right parenthesis space equals space x squared space space space space space space space space space space space space space x element of straight real numbers                                        

Sketch the graph of y = fg(x) , stating the coordinates of all points where the graph intercepts the coordinate axes.

 

15b
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2 marks

How many solutions are there to the equation fg(x) = 5 ?
How many solutions are there to the equation fg(x) = 9 ?

15c
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2 marks

Write down the solutions to the equation fg(x) = 0.

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1a2 marks
A graph with a parabola opening upwards, vertex at the origin, labelled x-axis and y-axis. Origin is marked O, axes have arrows indicating positive direction.
Figure 4

Figure 4 shows a sketch of the graph of y equals straight g open parentheses x close parentheses, where

straight g open parentheses x close parentheses equals open curly brackets table row cell open parentheses x minus 2 close parentheses squared plus 1 end cell cell x less or equal than 2 end cell row cell 4 x minus 7 end cell cell x greater than 2 end cell end table close

Find the value of gg open parentheses 0 close parentheses.

1b
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4 marks

Find all the values of x for which

straight g open parentheses x close parentheses greater than 28

1c1 mark

The function straight h is defined by

straight h open parentheses x close parentheses equals open parentheses x minus 2 close parentheses squared plus 1 space space space x less or equal than 2

Explain why straight h has an inverse but straight g does not.

1d
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3 marks

Solve

straight h to the power of negative 1 end exponent open parentheses x close parentheses equals negative 1 half

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2a2 marks

The function straight f is defined by

straight f open parentheses x close parentheses equals fraction numerator 8 x plus 5 over denominator 2 x plus 3 end fraction space space space space space space space space space space space space space x greater than negative 3 over 2

Find straight f to the power of negative 1 end exponent open parentheses 3 over 2 close parentheses

2b2 marks

Show that

straight f open parentheses x close parentheses equals A plus fraction numerator B over denominator 2 x plus 3 end fraction

where A and B are constants to be found.

2c1 mark

The function straight g is defined by

straight g open parentheses x close parentheses equals 16 minus x squared space space space space space space space space space space space space space 0 less or equal than x less or equal than 4

State the range of straight g to the power of negative 1 end exponent

2d3 marks

Find the range of space straight f straight g to the power of negative 1 end exponent

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3a2 marks
A V-shaped graph with its vertex at point P in the third quadrant.  The graph intersects the x-axis twice (both times to the left of the y-axis), and it intersects the y-axis once at a positive value of y. The axes are labelled x and y. The origin is marked O.
Figure 2

Figure 2 shows a sketch of the graph with equation

y space equals space 2 open vertical bar x plus 4 close vertical bar minus 5

The vertex of the graph is at the point P, shown in Figure 2.

Find the coordinates of P.

3b2 marks

Solve the equation

3 x plus 40 equals 2 open vertical bar x plus 4 close vertical bar minus 5

3c3 marks

A line l has equation y equals a x, where a is a constant.

Given that l intersects y equals 2 open vertical bar x plus 4 close vertical bar minus 5 at least once,

find the range of possible values of a, writing your answer in set notation.

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4a4 marks
Graph of a V-shaped function with lines converging at some point on the positive x-axis.
Figure 4

Figure 4 shows a sketch of the graph with equation

y equals open vertical bar 2 x minus 3 k close vertical bar

where k is a positive constant.

Sketch the graph with equation y equals straight f open parentheses x close parentheses where

straight f left parenthesis x right parenthesis equals k minus open vertical bar 2 x minus 3 k close vertical bar

stating

  • the coordinates of the maximum point

  • the coordinates of any points where the graph cuts the coordinate axes

4b4 marks

Find, in terms of k, the set of values of x for which

k minus open vertical bar 2 x minus 3 k close vertical bar greater than x minus k

giving your answer in set notation.

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5
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4 marks

State whether the following mappings are one-to-one, many-to-one, one-to-many or many-to-many.

(i)       straight f colon space x space rightwards arrow from bar space 2 space minus space x cubed

(ii) straight f colon space x space rightwards arrow from bar space sin space x

(iii)     straight f colon space x space rightwards arrow from bar space 1 over x squared

(iv) straight f colon space x space rightwards arrow from bar space ln space x   

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6a
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1 mark

It is given

 straight f left parenthesis x right parenthesis space equals space 2 over x

                             

 

Write down the domain of the function f(x)

6b
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3 marks

Sketch the graph of y = f(x), stating the coordinates of any intersections with the coordinate axes and the equations of any asymptotes.

6c
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1 mark

Write down the range of f(x).

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7a
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1 mark

The function f(x) is defined as

 straight f left parenthesis x right parenthesis space equals space x left parenthesis x space plus space 3 right parenthesis to the power of 2 space end exponent plus space 1 space space space space space space space space space space x greater or equal than 0

Work out the range of f(x) .

7b
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2 marks

If the domain of f(x) is changed to x less or equal than 0, what is the range of  f(x)?

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8a
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1 mark

The functions f(x) and g(x) are defined as follows

straight f left parenthesis x right parenthesis space equals space 3 x squared space plus space 2 space space space space space space space space space space x element of straight real numbers

 g left parenthesis x right parenthesis space equals space 1 space minus space 3 x space space space space space space space space space space space x element of straight real numbers

Write down the range of f(x).

8b
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4 marks

Find

(i)  fg(x)

(ii)  gf(x)

8c
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2 marks

Solve the equation f(x) = g(x) + 1

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9a
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3 marks

The graph of y = f(x) is shown below.

28-q5-edexcel-al-maths-pure-hard

 

(i)  Use the graph to write down the domain and range of f(x) .
(ii)  Write down the equation of the dotted line on the graph.

9b
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2 marks

On the diagram above sketch the graph of y = f−1(x) .

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10a
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3 marks

On the same axes, sketch the graphs of y equals vertical line straight f left parenthesis x right parenthesis vertical line  and y equals vertical line g left parenthesis x right parenthesis vertical line   where

straight f left parenthesis x right parenthesis space equals space 3 x space minus space 1 space space space space space space space space space space x element of straight real numbers

g left parenthesis x right parenthesis space equals space 2 x space plus space 2 space space space space space space space space space space x element of straight real numbers

Label the points at which the graphs intersect the coordinate axes.

10b
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3 marks

Solve the equation vertical line straight f left parenthesis x right parenthesis vertical line space equals space vertical line g left parenthesis x right parenthesis vertical line.

10c
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1 mark

Which of the solutions to vertical line straight f left parenthesis x right parenthesis vertical line space equals space vertical line g left parenthesis x right parenthesis vertical line is also a solution to straight f left parenthesis x right parenthesis space equals space g left parenthesis x right parenthesis?

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11a
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3 marks

The functions f(x) and  g(x) are defined as follows

straight f left parenthesis x right parenthesis space equals space e to the power of x minus 2 end exponent space space space space space space space space space space space space space space space space space space x element of straight real numbers space space space

 g left parenthesis x right parenthesis space equals space 2 space plus space ln space x space space space space space space space space space space x element of straight real numbers comma x greater than 0

Find 

(i) straight f g left parenthesis x right parenthesis

(ii)g straight f left parenthesis x right parenthesis

11b
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2 marks

Write down f−1(x)  and state its domain and range.

11c
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2 marks

The graphs of  f(x)  and f−1(x) are drawn on the same axes. Describe the transformation that would map one graph onto the other.

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12a
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4 marks

The functions f(x), g(x) are defined as follows

straight f left parenthesis x right parenthesis space equals space vertical line x minus 2 vertical line space minus space 5 space space space space space space space space space space space x element of straight real numbers

g left parenthesis x right parenthesis space equals space vertical line x vertical line space space space space space space space space space space space space space space space space space space space space space space space space space space x element of straight real numbers

Sketch the graph of y = gf(x), stating the coordinates of all points where the graph intercepts the coordinate axes.

12b
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2 marks

(i)   How many solutions are there to the equation gf(x) = 1?

(ii)  How many solutions are there to the equation gf(x) = 10?

12c
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3 marks

Solve the equation gf(x) = 2.

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13
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3 marks

Solve the equation vertical line x to the power of 2 space end exponent minus space 4 vertical line space equals space 3 , giving your answers in exact form.

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1a1 mark

The function straight f is defined by

straight f open parentheses x close parentheses equals 3 plus square root of x minus 2 end root space space space space space space space space space space space x element of straight real numbers space space space space space space space space space x greater than 2

State the range of straight f

1b3 marks

Find straight f to the power of negative 1 end exponent

1c2 marks

The function straight g is defined by

straight g open parentheses x close parentheses equals fraction numerator 15 over denominator x minus 3 end fraction space space space space space space space space space space x element of straight real numbers space space space space space space space space x not equal to 3

Find gf open parentheses 6 close parentheses

1d
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2 marks

Find the exact value of the constant a for which

straight f open parentheses a squared plus 2 close parentheses equals straight g open parentheses a close parentheses

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2
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4 marks

State whether the  following mappings are one-to-one, many-to-one, one-to-many or many-to-many.

(i)   straight f colon space x space rightwards arrow from bar space tan space x   

(ii)   straight f colon space x space rightwards arrow from bar space vertical line 1 over x vertical line

(iii)  straight f colon space x space rightwards arrow from bar space square root of x squared end root

(iv)  straight f colon space x space rightwards arrow from bar space plus-or-minus space square root of 25 minus x squared end root

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3a
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2 marks

It is given

straight f left parenthesis x right parenthesis space equals space 4 x cubed space plus space 4 x to the power of 2 space end exponent space minus space 7 x space plus space 2              

Write down the domain and range of the function f(x).

3b
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3 marks

 Sketch the graph of  y = f(x), stating the coordinates of any intersections with the coordinate axes. (You do not need to give the coordinates of any turning points.)

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4a
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2 marks

The function f(x)  is defined as

straight f left parenthesis x right parenthesis space equals space left parenthesis x space minus space 3 right parenthesis squared left parenthesis x space minus space 4 right parenthesis squared space space space space space space space space space space space space 2 less or equal than x less or equal than 5

Work out the range of f(x).

4b
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1 mark

If the domain of f(x) is changed to x less or equal than 2, what is the range of f(x)?

4c
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1 mark

State another domain for f(x) that would have the same effect as that in part (b).

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5a
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1 mark

The functions f(x) and g(x) are defined as follows

straight f left parenthesis x right parenthesis space equals space x to the power of 2 space end exponent minus space 2 space space space space space space space space space space x element of straight real numbers

g left parenthesis x right parenthesis space equals space 1 space minus space 2 over x space space space space space space space space space x element of straight real numbers comma x not equal to 0

           

Write down the range of f(x).

5b
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3 marks

Leaving your answers as single fractions, find

(i)   fg(x)       

(ii) gf(x)

5c
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2 marks

Solve the equation f(x) = g(x)

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6a
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3 marks

The graphs of y = f(x) and y = x (dotted line) are shown in the diagram below.

f open parentheses x close parentheses has rotational symmetry about the origin and for x greater than 0,there is a vertical line line of symmetry at x equals 4.5.

 

2-8-vh-q5-edexcel-al-maths-pure

(i) Use the graph to write down the domain and range of f open parentheses x close parentheses.

  

(ii) On the diagram above sketch the reflection of f open parentheses x close parentheses in the line y equals x and explain why this cannot be the graph of f to the power of negative 1 end exponent open parentheses x close parentheses.

6b
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2 marks

(i) Given that the maximum solution to f open parentheses x close parentheses equals 6. is x equals 6 state the restriction on the domain of f open parentheses x close parentheses such that f to the power of negative 1 end exponent open parentheses x close parentheses exists.

 

(ii) Hence, or otherwise, write down the domain and range of f to the power of negative 1 end exponent open parentheses x close parentheses.

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7a
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3 marks

On the same axes, sketch the graphs of y = f(x) and y space equals space vertical line g left parenthesis x right parenthesis vertical line where

straight f left parenthesis x right parenthesis space equals space square root of x space space space space space space space space space space space space space space space space x greater or equal than 0

g left parenthesis x right parenthesis space equals space 2 x space minus space 3 space space space space space space space space space space x element of straight real numbers

Label the points at which the graphs intersect the coordinate axes.

7b
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3 marks

Solve the equation straight f left parenthesis x right parenthesis space equals space vertical line g left parenthesis x right parenthesis vertical line.

7c
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1 mark

Which of the solutions to straight f left parenthesis x right parenthesis space equals space vertical line g left parenthesis x right parenthesis vertical line  is not a solution to f(x)  =  g(x) ?

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8a
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1 mark

The function f(x) is defined as

straight f colon space x space rightwards arrow from bar space square root of left parenthesis 25 minus x squared right parenthesis end root space space space space space space space space space space x element of straight real numbers comma negative 5 less or equal than x less or equal than 5

Explain why the inverse of  f(x) does not exist.

8b
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2 marks

Suggest an adaption to the domain of f(x) so the following conditions are met:

  • the inverse of f(x) exists,

  • the graph of y = f(x) lies in the first quadrant only, and,

  • the domain of f(x) is as large as possible.

State the range for your adapted f(x).

8c
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3 marks

The domain of f(x) is changed to negative 5 less or equal than x less or equal than 0.
Find an expression for   straight f to the power of negative 1 end exponent left parenthesis x right parenthesis and state its domain and range.

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9a
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3 marks

The functions f(x) and g(x) are defined as follows

 straight f left parenthesis x right parenthesis space equals space left parenthesis x space minus space 1 right parenthesis squared space minus space 4 space space space space space space space space space space space x element of straight real numbers comma x greater or equal than 1

g left parenthesis x right parenthesis equals space 1 space plus space square root of left parenthesis x plus 4 right parenthesis space end root space space space space space space space space space space x element of straight real numbers comma x greater or equal than negative 4

Find 

(i)  fg(x)

(ii)  gf(x)

9b
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2 marks

Write down straight f to the power of negative 1 end exponent left parenthesis x right parenthesis and state its domain and range.

9c
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2 marks

The graphs of f(x) and straight f to the power of negative 1 end exponent left parenthesis x right parenthesis are drawn on the same axes. Describe the transformation that would map one graph onto the other.

9d
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2 marks

Find the coordinates of the point where the graphs of  y = f(x) and  y space equals space straight f to the power of negative 1 end exponent left parenthesis x right parenthesis meet. 

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10a
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4 marks

The graph of the function straight f left parenthesis x right parenthesis space equals space a vertical line x space plus space p vertical line space plus space q space spaceis shown below, where a comma space p space comma space q element of straight real numbers. The graph has a local maximum at the point A(3, 5)  and intersects the y-axis at (0,-7).

q7a-2-9-ib-aa-hl-further-functions-_-graphs-very-hard-dig

 

Find the values of a comma space p and q.Hence solve straight f open parentheses x close parentheses space equals space 0 space.

10b
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4 marks

Find the solutions to the equation straight f left parenthesis x right parenthesis space equals space open vertical bar 7 space minus space 2 x close vertical bar.

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11a
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3 marks

The functions f(x), g(x) are defined as follows

 straight f left parenthesis x right parenthesis space equals space vertical line x to the power of 3 space end exponent minus space 8 vertical line space space space space space space space space space space x element of straight real numbers

g left parenthesis x right parenthesis space equals space open vertical bar x close vertical bar space space space space space space space space space space space space space space space space space space space space space space space x element of straight real numbers space space space

Sketch the graph of y = fg(x), stating the coordinates of all points where the graph intercepts the coordinate axes.

11b
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3 marks

There are between 0 and 4 solutions to the equation fg(x) = c , where c is a real number. 
Determine the values of c that produce each number of solutions.

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12
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3 marks

Solve the equation vertical line x squared space minus space 9 vertical line space equals space 6 space minus space 0.25 x squared, giving your answers in exact form.

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