Rational Expressions (A Level only) (OCR A Level Maths: Pure)

Exam Questions

4 hours43 questions
1
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3 marks

Simplify

(i)
x squared over x 

(ii)
fraction numerator x open parentheses x minus 1 close parentheses over denominator x end fraction 

(iii)
fraction numerator 6 x plus 2 over denominator 2 end fraction 

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2
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3 marks
(i)

Factorise x squared plus 7 x plus 12

(ii)

Hence simplify fraction numerator x squared plus 7 x plus 12 over denominator 2 left parenthesis x space plus space 3 right parenthesis end fraction 

 

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3a
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2 marks

Simplify fully fraction numerator 2 x squared plus 10 x over denominator 2 left parenthesis x space plus space 5 right parenthesis end fraction

3b
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3 marks

Simplify fully fraction numerator 3 x squared over denominator x space plus space 4 end fraction cross times fraction numerator x squared plus 5 x plus 4 over denominator x end fraction

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4
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4 marks
(i)
Fully factorise x cubed minus 9 x squared plus 20 x
 

(ii)
Hence simplify fraction numerator x cubed minus 9 x squared plus 20 x over denominator x squared minus 5 x end fraction 

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5a
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2 marks

The function  is given by straight f left parenthesis x right parenthesis equals 2 x cubed plus 7 x squared minus 4 x.

Show that straight f left parenthesis x right parenthesis equals x left parenthesis 2 x minus 1 right parenthesis left parenthesis x plus 4 right parenthesis.

5b
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2 marks

Hence, or otherwise, write down the real solutions to the equation

fraction numerator straight f left parenthesis x right parenthesis over denominator x plus 1 end fraction equals 0.

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6a
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2 marks

The function straight f left parenthesis x right parenthesis is given by

straight f left parenthesis x right parenthesis equals x cubed minus 4 x squared minus 7 x plus 10

Work out straight f left parenthesis 1 right parenthesis and hence write down a factor of straight f left parenthesis x right parenthesis.

6b
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2 marks

Work out straight f left parenthesis x right parenthesis divided by left parenthesis x plus 2 right parenthesis.

6c
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3 marks

Write straight f left parenthesis x right parenthesis space in the form left parenthesis x plus a right parenthesis left parenthesis x plus b right parenthesis left parenthesis x plus c right parenthesis where a comma space b space and space c are integers to be found.

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7
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2 marks

Which one of the following algebraic fractions is improper?  Explain your answer.

fraction numerator x squared plus 5 x minus 1 over denominator x cubed minus 2 end fraction fraction numerator x squared plus 3 x plus 2 over denominator x squared minus 3 x plus 2 end fraction fraction numerator x space plus space 1 over denominator left parenthesis x minus 1 right parenthesis squared end fraction

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8
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3 marks

Find the remainder when x cubed plus 2 x squared minus 5 x plus 8 is divided by left parenthesis x minus 3 right parenthesis.

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9a
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3 marks

Given that left parenthesis x squared minus 8 x minus 20 right parenthesis divided by left parenthesis x minus 2 right parenthesis equals A x plus B plus fraction numerator C over denominator x minus 2 end fraction

where A comma space B space and space C are integer constants.

In terms of A comma space B and/or C as appropriate

(i)
Write down the divisor.
(ii)
Write down the quotient.
(iii)
Write down the remainder.

9b
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4 marks

Find the values of A comma space B space and space C.

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10
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4 marks

The function straight f left parenthesis x right parenthesis is given by

straight f left parenthesis x right parenthesis equals x squared plus a x plus b

where a space and space b are integer constants.

It is also given that  space straight f left parenthesis 3 right parenthesis equals straight f left parenthesis negative 8 right parenthesis equals 0.

Find the values of a space and space b.

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1
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4 marks

Simplify

(i)
fraction numerator x over denominator 2 x end fraction
 

(ii)
fraction numerator x plus 1 over denominator x left parenthesis x plus 1 right parenthesis end fraction
 
(iii)
fraction numerator 6 x plus 12 over denominator x squared plus 2 x end fraction 

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2a
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3 marks

Simplify fully fraction numerator 2 x squared plus 6 x over denominator x cubed plus 3 x squared end fraction

2b
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3 marks

Simplify fully fraction numerator x plus 4 over denominator x cubed end fraction cross times fraction numerator x squared plus 2 x over denominator x plus 4 end fraction

2c
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3 marks

Simplify fully fraction numerator x squared plus 4 x over denominator 3 x plus 6 end fraction divided by fraction numerator 2 x plus 8 over denominator x plus 2 end fraction

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3a
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2 marks

The function straight f left parenthesis x right parenthesis is given by

straight f left parenthesis x right parenthesis equals 3 x cubed minus 5 x squared minus 4 x plus 4

Show that straight f open parentheses 2 over 3 close parentheses space equals 0.

3b
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1 mark

Hence write down a factor of straight f left parenthesis x right parenthesis.

3c
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3 marks

Fully factorise straight f left parenthesis x right parenthesis.

3d
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2 marks

Write down the solutions to the equation straight f left parenthesis x right parenthesis space equals 0.

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4a
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2 marks

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