Exponential & Logarithms (Edexcel International A Level Maths: Pure 3)

Exam Questions

4 hours52 questions
1
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3 marks

Sketch the graph with equation y equals a to the power of x space comma space a greater than 1, stating the coordinates of the point where the graph intersects the y-axis and the equation of any asymptotes.

Also state whether this equation would represent exponential growth or decay.

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2
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3 marks

The following equations can be used for exponential models.

State whether each one would represent exponential growth or exponential decay.

   (i)   

y equals 3 to the power of negative 2 x end exponent

   (ii)   

y equals 20 open parentheses 2 close parentheses to the power of x

   (iii)
   y equals 30 a to the power of negative x end exponent where a greater than 0

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3
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3 marks

Sketch the graph of y equals e to the power of x, clearly showing the coordinates of the point where the graph intercepts the y-axis and stating the equations of any asymptotes.

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4
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2 marks

Given y equals e to the power of 2 x end exponent:

(i)      Write down an expression for begin inline style fraction numerator d y over denominator d x end fraction end style.

(ii)
Find the gradient of y equals e to the power of 2 x end exponent at the point where x equals 0.

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5
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3 marks

Solve the equation e to the power of negative 2 x end exponent minus 16 equals 0, giving your answer in the form a ln a where a is an integer.

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6
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4 marks

Write the following in the form a plus b space In space 2 comma where a and b are integers to be found.

(i)
3 squared plus space In space 4
(ii)
In space e to the power of 7 plus space In space 8
(iii)
log space 1000 space plus space 3 space In space 16
(iv)
5 open parentheses 3 squared plus space In space 64 close parentheses

 

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7
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4 marks

Solve the following equations, giving your answer in exact form.

   (i)    
e to the power of 2 x end exponent equals 5

   (ii)   3 e to the power of 1 third x end exponent space equals space 27

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8
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2 marks

A square has side length 3 space In space 4.

Show that the perimeter of the square is 24 space In space 2.

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9
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3 marks

Write the following in the form a space In space b, where a and b are integers to be found.

            4 space In space 9 space plus space 2 space In space 81 minus space 3 space In space 27

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10
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4 marks

Write down the value of

(i)
log subscript 3 cubed
(ii)
In space e to the power of 6
(iii)
log subscript a to the power of 1
(iv)
log space 1000

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11a
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1 mark

Express 42 as a product of its prime factors.

11b
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2 marks

Hence, or otherwise, show that

         In space 42 equals In space 7 plus In space 3 plus In space 2.

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12
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2 marks

Sketch the graph of y equals e to the power of x comma marking clearly the coordinates of any points where the graph intersects the coordinate axes ans stating the equation of any asymptotes.

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1a
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3 marks

Sketch the graph of y equals 2 to the power of negative x end exponent, stating whether this graph indicates exponential growth or exponential decay.

1b
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1 mark

Find the exact value of y spacewhen x equals 3.

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2
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4 marks

Write down the value of a in the following statements.

(i)

log subscript a space 8 equals 3

(ii)

log subscript a space equals space 2

(iii)

ln space e to the power of 3 space end exponent equals space a

(iv)
log subscript 5 space a equals 1

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3a
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4 marks

On the same axes, sketch the graphs of y equals e to the power of x and y equals e to the power of negative x end exponent.
Label any points where the graphs intersect the coordinate axes.
Write down the equations of any asymptotes.

3b
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1 mark

Write down the gradient of y equals e to the power of x at the point open parentheses 0 comma 1 close parentheses.

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4a
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1 mark

Given y equals e to the power of 4 x end exponent write down an expression for begin mathsize 20px style begin inline style fraction numerator straight d y over denominator straight d x end fraction end style end style.

4b
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1 mark

Given y equals 2 e to the power of 2 x end exponent write down an expression for begin mathsize 20px style begin inline style fraction numerator straight d y over denominator straight d x end fraction end style end style.

4c
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3 marks

Find the gradient y equals 3 e to the power of negative 2 x end exponent of at the point where x equals 3.
Give your answer in the form p e to the power of q, where p and q are integers to be found.

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5a
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2 marks

(i) Write down the gradient of y equals e to the power of negative 3 x end exponent.

(ii) Find the gradient of y equals e to the power of negative 3 x end exponent at the point where x equals 0.

5b
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2 marks

(i)   In terms of e, write down the gradient of y equals e to the power of negative 3 x end exponent at the point where x equals 2.

(ii)  Find the value for x for which the gradient of y equals e to the power of negative 3 x end exponent is negative 3 e to the power of negative 12 end exponent.

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6a
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3 marks

The function straight f open parentheses x close parentheses is defined by straight f open parentheses x close parenthesesequals 2 e to the power of 3 x end exponent for x element of straight real numbers

(i)

Find straight f open parentheses negative x close parentheses.

(ii)
On the same axes, sketch the graphs of y equals straight f open parentheses x close parentheses and y equals straight f open parentheses negative x close parentheses.

          Label any points where the graphs intersect the coordinate axes.

6b
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2 marks

Describe the transformation from y equals straight f open parentheses x close parentheses to y equals negative straight f open parentheses x close parentheses.

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7
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3 marks

Solve e to the power of 2 x end exponent minus 8 e to the power of x plus 15 equals 0, giving your answers to 3 significant figures.

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8a
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2 marks

Evaluate 

      log subscript 2 space 4 space plus space log subscript 3 space 27 space minus space log subscript 4 space 4

8b
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3 marks

Evaluate

      3 space In space 2 space plus space 1 half space In space 81 space minus space 2 space In space 3 comma

giving your answer in the form In space q where q is an integer to be found.

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9a
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2 marks

Solve the following equations, giving your answers in exact form.

   e to the power of x space equals space 5

9b
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3 marks

3 e to the power of 2 x end exponent space equals space 9

9c
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3 marks

e to the power of 2 x minus 1 end exponent space equals space 4

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10a
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3 marks

Write the following as a single algorithm

            2 space log subscript a 6 space plus space 3 space log subscript a space 2 space minus space log subscript a space 4

10b
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3 marks

Write the following in the form a In b comma where a and b are integers to be found.

         2 In space 3 to the power of 4 space plus space In space 3 cubed space minus space In space 9

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11
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4 marks

The diagram below shows the length of three sides of a triangle, with each side measured in centimetres.

q5-6-1-laws-of-logarithms-edexcel-a-level-pure-maths-medium

Work out the perimeter of the triangle, giving your answer in the form 2ln space b, where b is an integer to be found.

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12
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3 marks

Show that

      2 In space x cubed space minus space 3 In space x squared space equals 0.

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13
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5 marks
(i)
On the same axes, sketch the graphs of y equals e to the power of x and y equals e to the power of negative x end exponent.
Label any points of intersection between each graph and the coordinates axes.
Write down the equations of any asymptotes.
(ii)
Write down the equation of the line of reflection between the graphs of y equals e to the power of x and y equals space e to the power of negative x end exponent.

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1a
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3 marks
(i)

Sketch the graph of y equals 0.4 to the power of x.

(ii)
State whether this graph indicates exponential growth or exponential decay.
1b
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1 mark

Find the value of x when y equals 0.064.

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2a
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3 marks

Sketch the graph of y equals 12 e to the power of negative x end exponent for x greater or equal than 0.
Label any points of intersection with the coordinate axes.
Write down the equations of any asymptotes.

2b
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1 mark

Write down the gradient of y equals 12 e to the power of negative x end exponent at the point where x equals 0.

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3a
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2 marks

The function straight f open parentheses x close parentheses is defined by straight f open parentheses x close parentheses equals 3 straight e to the power of 2 straight x end exponent for x element of straight real numbers.

Find straight f open parentheses italic 2 x close parentheses.

3b
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2 marks

Find straight f apostrophe open parentheses italic 2 x close parentheses.

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4
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3 marks

Solve 2 e to the power of 2 x end exponent equals e to the power of x plus 10, giving your answer to 3 significant figures.

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5a
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1 mark

Find the gradient of the curve y equals a e to the power of b x end exponent where and a and b are constants.

5b
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2 marks

At the point open parentheses 0 comma a close parentheses the gradient is 12, find b spacein terms of a.

5c
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1 mark

Hence write down y in terms of a (and x) only.

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6a
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3 marks

Show that the equation e to the power of x minus e to the power of negative x end exponent equals 0 has only one real solution.

6b
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2 marks

Explain why the equation e to the power of x plus e to the power of negative x end exponent equals 0 has no real solutions.

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7a
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2 marks

Evaluate

      log subscript 2 space 8 squared space plus space 3 log subscript 2 space 16 space minus space 2 log subscript 2 space 2 to the power of 5.

7b
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3 marks

Evaluate

      3 In space 2 plus space 2 In space 5 space minus space 1 half In space 10 space 000 comma

giving your answer in the form In space p.

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8a
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2 marks

Solve the following equations, giving your answers in exact form.

   4 e to the power of 3 x minus 2 end exponent space equals space 12

8b
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3 marks

3 e to the power of 2 x end exponent plus space 8 space equals space 14 e to the power of x

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9a
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2 marks

Simplify

      2 In space 3 to the power of 4 space plus space In space 3 cubed space minus space In space 9 comma

giving your answer in the form a In b, where a and b are integers to be found.

9b
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2 marks

Write

      2 log subscript a x space plus space 3 space log subscript a open parentheses x plus 1 close parentheses space minus space log subscript a space 4 open parentheses x plus 2 close parentheses

as a single algorithm.

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10
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5 marks
(i)
On the same axes, sketch the graphs of y equals e to the power of x and y equals space In space x.
On each graph, label any points where the graph intersects the coordinate axes.
Write down the equations of any asymptotes for each graph.
(ii)
Write down the line of reflection between the graphs y equals e to the power of x and y space equals space In space x.

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11
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5 marks

Solve the equations

         6 space cross times space 3 to the power of x minus 1 end exponent space equals space 6 to the power of 2 x end exponent comma

giving your answer in the form fraction numerator In space a over denominator In space b apostrophe end fraction where a and b are integers to be found.

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12
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4 marks

A ship sets from a harbour.

After some time, the ship's position is open parentheses 4 In space 3 close parentheses km east of the harbour and open parentheses 3 In space 3 close parentheses km north of the harbour.

Find the direct distance between the ship and the harbour at this time giving your answer in the form open parentheses p In space 3 close parentheses space km.

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13
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3 marks

By writing 5 as 5 In space e comma show that

         5 In space 2 plus 5

can be written as 5 space In space 2 e.

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1a
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3 marks

Sketch the graph of y equals 0.2 to the power of negative x end exponent, stating whether this graph indicates exponential growth or exponential decay.

1b
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1 mark

Find the value of x when y equals 625.

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2a
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2 marks

Without using a calculator, evaluate log subscript 4 space 128.
Show each stage of your solution carefully.

2b
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2 marks

Evaluate begin mathsize 20px style begin inline style fraction numerator 3 log subscript 6 space 216 minus ln space e to the power of g plus 4 log subscript 5 space 625 over denominator log space 10000 end fraction end style end style.

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3a
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3 marks

Sketch the graph of y equals 4 e to the power of x for x greater or equal than 0.
Label any points of intersection with the coordinate axes.
Write down the equations of any asymptotes.

3b
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1 mark

Find the gradient of y equals 4 e to the power of x at the point where x equals 3, giving your answer correct to 3 significant figures.

3c
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1 mark

The population growth of population, P, at time, t years, is modelled by the equation .

P equals 4 e to the power of t.
Write down the initial population.

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4a
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2 marks

The function straight f open parentheses x close parentheses is defined by straight f open parentheses x close parenthesesequals 5 e to the power of 3 x end exponent for x element of straight real numbers.

Find straight f open parentheses x close parentheses.

4b
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2 marks

Find straight f apostrophe open parentheses 5 x close parentheses.

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5a
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1 mark

Find the gradient of the curve y equals begin inline style 1 over a end style e to the power of negative b x end exponent where a and b are constants.

5b
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1 mark

State a condition on b to ensure y spacerepresents exponential decay.

5c
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2 marks

At the point open parentheses 0 comma a close parentheses the gradient is 10. Find y in terms of a (and x) only.

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6a
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1 mark

A particle is travelling with velocity, v ms-1, at time t seconds.
The velocity of the particle is modelled v equals 0.3 e to the power of k t end exponent, where k is a constant.

Write down the initial velocity of the particle.

6b
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2 marks

Find an expression (in terms of k and t) for the acceleration of the particle.

6c
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3 marks

After 12 seconds the velocity of the particle is 0.9 ms-1.
Find the value of k, giving your answer to 3 significant figures.

6d
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1 mark

State a problem with the model for large values of t

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7
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4 marks

Solve open parentheses e to the power of x minus e to the power of negative x end exponent close parentheses squared equals 0.

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8
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5 marks

Solve the equation 2 e to the power of 3 x end exponent minus 11 e to the power of 2 x end exponent plus 12 e to the power of x equals 0, giving answers to 3 significant figures where appropriate.

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9a
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2 marks

Evaluate

      4 log subscript 3 space 729 space plus 3 log subscript 2 space 64 squared space minus space 3 log space 100 space plus In space e to the power of 6

9b
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3 marks

Evaluate

      1 half In space 196 space plus space 1 third In space 125 space plus space 1 fourth In space 81 plus space 1 fifth In space 32

giving your answer in the form In space q.

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10a
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3 marks

Solve the following equations, giving your answers correct to 3 significant figures.

begin mathsize 20px style 8 e to the power of 3 x to the power of 2 minus 1 end exponent end exponent equals 12 end style

10b
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3 marks

e to the power of 3 x end exponent minus 42 space equals space 2 e to the power of x open parentheses 6 e to the power of x space end exponent minus 7 close parentheses

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11
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5 marks

On the same axes, sketch the graphs of y equals e to the power of 2 x end exponent and y equals 1 half In space x.

On each graph, label any point where intersects the coordinate axes.

Write down the equations of any asymptotes for each graph.

Explain the significance of the line y equals x.

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12
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3 marks

Show that 4 minus In space 16 can be written in the form 4 In(e over 2).

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13
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5 marks

A triangle is drawn inside a circle such that one side of the triangle is the diameter and all three vertices of the triangle lie on the circumference.

The radius of the circle is open parentheses 3 space In space 2 close parentheses space cm.

The two smallest angles in the triangle are alpha and beta respectively where  beta equals 2 alpha.

Find all three sides of the triangle, giving your answers in the form a In space 2.

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14
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3 marks

How many real solutions does the equations have? Justify your answer.

            3 space log subscript x open parentheses x plus 1 close parentheses equals space In space e cubed

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