Inequalities (OCR AS Maths: Pure)

Exam Questions

3 hours43 questions
1
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3 marks

Solve the inequalities:

(i)
2 x greater or equal than 8
(ii)
3 plus 2 x less than 11
(iii)
5 plus x greater than 4 x minus 1

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2
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4 marks

Solve the inequalities:

(i)
2 x minus 9 greater or equal than 5 left parenthesis x minus 3 right parenthesis
(ii)
3 left parenthesis 5 minus x right parenthesis less than 2 left parenthesis 9 minus 2 x right parenthesis

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3a
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2 marks

Write down the solutions to left parenthesis x minus 3 right parenthesis left parenthesis x minus 8 right parenthesis equals 0.

3b
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2 marks

Sketch the graph of space y equals left parenthesis x minus 3 right parenthesis left parenthesis x minus 8 right parenthesis, clearly showing the coordinates of the points where the graph intercepts the x-axis.

3c
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2 marks

Hence, or otherwise, solve the inequality left parenthesis x minus 3 right parenthesis left parenthesis x minus 8 right parenthesis less than 0.

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4a
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2 marks

Find the discriminant for the quadratic function x squared plus 8 x plus 15.

4b
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2 marks

Write down the number of real solutions to the equation x squared plus 8 x plus 15 space equals 0.

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5
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4 marks

On the axes below, show the region bounded by the inequalities

x greater or equal than 0
y less or equal than 4
x less or equal than 5
y greater or equal than 1

2-4-edexcel-alevel-maths-pure-q5easy

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6a
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3 marks
(i)
Solve the equation 9 minus x squared equals 0.
(ii)
Use symmetry to write down the coordinates of the turning point on the graph of y equals 9 minus x squared.
6b
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3 marks

Sketch the graph of y equals 9 minus x squared and hence solve the inequality 9 minus x squared space greater or equal than 0.

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7a
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1 mark

Write down, in terms of k, the discriminant of x squared plus 8 x plus 4 k.

7b
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2 marks

Hence find the values of for k which the equation x squared plus 8 x plus 4 k equals 0 has two real and distinct solutions.

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8
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3 marks

Write down the three inequalities that define the region R shown in the diagram below.

2-4-edexcel-alevel-maths-pure-q8easy

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9
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4 marks

The total cost to a company manufacturing c cables is left parenthesis 500 plus 3 c right parenthesis pence.

The total income from selling all c cables is left parenthesis 5 c minus 3500 right parenthesis pence.

What is the minimum number of cables the company needs to sell in order to recover their costs?

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10
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4 marks

The equation x squared plus k x plus 4 equals 0, where k is a constant, has no real roots.

Find the possible value(s) of k.

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11
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4 marks

Solve the inequality 6 x minus 7 less or equal than 35, giving your answer in set notation.

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12
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3 marks

Solve the inequality 6 less or equal than 8 x minus 2 less or equal than 22.

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1
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3 marks

Solve the inequality 3 x plus 4 less or equal than 5 left parenthesis x minus 1 right parenthesis.

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2
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4 marks

Solve the inequality x squared minus 5 x greater than 6.

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3
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4 marks

The equation k x squared plus 2 k x plus 4 equals 0, where k is a constant, has two distinct real roots.

Find the possible value(s) of k.

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4
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5 marks

On the axes below show the region satisfied by the inequalities

x plus 2 y greater than 3
y less or equal than x plus 4
y plus 3 x less than 8

Label this region R.

2-4-edexcel-alevel-maths-pure-q4medium

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5
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5 marks

Find the values of x that satisfy the inequalities

x squared plus 3 x greater than 4
4 x plus 1 greater than 4

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6
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4 marks

Solve the inequality negative 2 less or equal than 3 x minus 4 less or equal than 5, giving your answer in set notation.

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7a
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3 marks

The cross section of a tunnel is in the shape of the region defined by the inequalities

y less or equal than 5 minus x squared over 5 y greater or equal than 0

On the axes below show the region satisfying the inequalities

2-4-edexcel-alevel-maths-pure-q7medium

7b
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2 marks

Given that x andspace y are in metres write down the height and the maximum width of the tunnel.

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8
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4 marks

Write down the inequalities that define the region R shown in the diagram below.

2-4-edexcel-alevel-maths-pure-q8medium

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9
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4 marks

The total cost to a company manufacturing c cables is left parenthesis 100 plus 5 c right parenthesis pence.

The total income from selling all c cables is left parenthesis 30 c minus c squared right parenthesis pence.

What is the minimum number of cables the company needs to sell in order to recover their costs?

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10
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4 marks

A stone is projected vertically upwards from ground level.

The distance above the ground, d m at t seconds after launch, is given by

d left parenthesis t right parenthesis equals 12 t minus 4.9 t squared

How long does the stone remain 2 m above the ground?

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1
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3 marks

Solve the inequality left parenthesis x plus 2 right parenthesis squared greater than 5.

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2
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4 marks

Solve the inequality fraction numerator 5 over denominator 3 x squared plus 2 end fraction less or equal than 2.

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3
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4 marks

The equation left parenthesis k x right parenthesis squared plus left parenthesis k minus 2 right parenthesis x plus 1 equals 0, where k is a constant, has two distinct real roots.  Find the possible values of k.

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4
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5 marks

On the axes below show the region satisfied by the inequalities

space y plus x greater than x squared
5 y less than 20 minus 4 x
space y minus 1 greater or equal than 0

Label this region R.

2-4-edexcel-alevel-maths-pure-q4hard

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5
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5 marks

Find the values of x that satisfy the inequalities

x squared plus x less than 2
x squared less than 4

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6a
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4 marks

Solve the inequality negative 2 less or equal than x squared minus 4 less or equal than 5.

6b
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4 marks

Find the values of x that satisfy the inequalities

x squared plus 4 x minus 3 less or equal than 2 minus x squared minus 5 x
8 minus 2 x squared less or equal than 2 x left parenthesis 2 x plus 1 right parenthesis

Give your answer in set notation.

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7a
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3 marks

The cross section of a tunnel is in the shape of the region defined by the inequalities

x squared plus y squared less or equal than 25 y greater or equal than 0

On the axes below show the region satisfying the inequalities

2-4-edexcel-alevel-maths-pure-q7hard

7b
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2 marks

Given that x andspace y are in metres, write down the height and the maximum width of the tunnel.

7c
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2 marks

Find the area of the cross-section of the tunnel.

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8
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4 marks

Write down the inequalities that define the region R shown in the diagram below.

2-4-edexcel-alevel-maths-pure-q8hard

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9a
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2 marks

An electronics company can produce c cables at a total cost of left parenthesis 200 plus 10 c right parenthesis pence.
The cables can be sold for left parenthesis 40 minus c right parenthesis pence each.

Show that the total income from selling c cables is left parenthesis 40 c minus c squared right parenthesis pence

9b
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4 marks

What is the minimum number of cables the company needs to sell in order to make a profit?

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10
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4 marks

A stone is projected vertically upwards from a height of 1.5 m.
It’s height, above its starting position, d m at time t seconds after launch, is given by

d left parenthesis t right parenthesis equals 16 t minus 4.9 t squared

How long does the stone remain 3 m above the ground?

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1
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4 marks

Solve the simultaneous inequalities

t squared minus 2 t minus 15 less than 0 and
t squared plus 14 less or equal than 9 t.

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2
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4 marks

Solve the inequality fraction numerator 4 x squared minus 11 over denominator left parenthesis x plus 1 right parenthesis squared end fraction greater or equal than 4.

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3
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3 marks

The equation left parenthesis k plus 1 right parenthesis t squared plus 2 left parenthesis k plus 2 right parenthesis t equals 3 left parenthesis k plus 3 right parenthesis has real roots.

Find the possible values of k.

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4a
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3 marks

On the axes below show the region satisfied by the inequalities

x squared minus 9 less or equal than y
y less or equal than left parenthesis 2 plus x right parenthesis left parenthesis 2 minus x right parenthesis

Label this region R.

2-4-edexcel-alevel-maths-pure-q4vhard

4b
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1 mark

Write down the equation(s) of any line(s) of symmetry of the region R.

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5
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6 marks

Solve the inequality negative 6 less or equal than x squared plus 3 x minus 4 less or equal than 6, giving your answer in set notation.

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6
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5 marks

Solve the inequality 2 x squared plus 1 less or equal than x squared plus 10 x minus 8 less than 2 x squared minus 7 x plus 52, giving your answer in interval notation.

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7a
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2 marks

The cross section of a tunnel is in the shape of the region defined by the inequalities

y less or equal than 6 minus x squared over 6 y greater or equal than 0

On the axes below show the region satisfying the inequalities

2-4-edexcel-alevel-maths-pure-q7vhard

7b
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2 marks

Given that x and space y are in metres, write down the height and the maximum width of the tunnel.

7c
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3 marks

Using a semi-circle of radius 6, estimate the area of the cross-section of the tunnel.

7d
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2 marks

Given that the tunnel is to be 20 m in length estimate the volume of earth that will need to be removed in order to build the tunnel.

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8
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3 marks

Write down the inequalities that define the region R shown in the diagram below.

2-4-q8-inequalities-a-level-maths

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9a
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5 marks

An electronics company can produce c cables at a total cost of left parenthesis 160 plus 12 c right parenthesis pence.
The cables can then be sold for left parenthesis 38 minus c right parenthesis pence each.

Find the minimum and maximum number of cables the company needs to sell in order to make a profit?

9b
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1 mark

How many cables does the company need to sell to make the maximum profit?

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10
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5 marks

A stone is projected vertically upwards from a height of 2 m.
It’s height, above it’s starting position, d subscript 1 m, at time t seconds after launch, is given by

 d subscript 1 left parenthesis t right parenthesis equals 13.2 t minus 4.9 t squared

At the same time a second stone is projected upwards from a height of 2.3 m.
It’s height, above its starting position, is given by

 d subscript 2 left parenthesis t right parenthesis equals 13 t minus 4.9 t squared

For how long are both stones simultaneously at least 4 m above the ground?

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11a
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1 mark

A company produces x chairs andspace y tables in a day.  They sell every chair and every table they produce.  Due to the manufacturing processes involved the number of chairs and tables they can make in a day are limited by the following inequalities:

y less or equal than x plus 20
y greater or equal than 3 x minus 45
y less or equal than negative 2 x plus 80
x greater or equal than 0 comma y greater or equal than 0

Briefly explain why the inequalities x greater or equal than 0 space and y greater or equal than 0 are appropriate.

11b
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4 marks

On the axes below show the region within which the company can produce x chairs andspace y tables per day.

2-4-edexcel-alevel-maths-pure-q11vhard

11c
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3 marks

The company’s profit, £ P, per day, is given by the formula P equals 3 x plus 2 y.
Given that the maximum profit lies on a vertex of the region found in part (b), find the number of chairs and tables the company should make in order to maximise its daily profit.

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