Partial Fractions (Edexcel A Level Maths: Pure): Exam Questions

3 hours39 questions
14 marks

(i) Factorise x squared plus 5 x minus 6

(ii) Hence, express 

fraction numerator 5 x plus 16 over denominator x squared plus 5 x minus 6 end fraction

in partial fractions.

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22 marks

Write 

fraction numerator x space minus space 10 over denominator open parentheses x plus 2 close parentheses open parentheses x minus 1 close parentheses end fraction

in the form

fraction numerator A over denominator x plus 2 end fraction plus fraction numerator B over denominator x minus 1 end fraction 

where A spaceand B are integers to be found.

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33 marks

Express 

fraction numerator 2 x over denominator open parentheses x plus 1 close parentheses open parentheses x minus 2 close parentheses end fraction 

in partial fractions.

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43 marks

Write

fraction numerator 2 left parenthesis x minus 11 right parenthesis over denominator x squared plus 2 x minus 15 end fraction

in the form

fraction numerator A over denominator x plus 5 end fraction plus fraction numerator B over denominator x minus 3 end fraction

where A spaceand B are integers to be found.

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53 marks

Express

fraction numerator 1 over denominator x open parentheses x plus 1 close parentheses end fraction

in partial fractions.

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63 marks

Express 

fraction numerator 2 over denominator x open parentheses x plus 2 close parentheses end fraction 

in partial fractions.

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13 marks

Express fraction numerator 3 over denominator open parentheses 2 x minus 1 close parentheses open parentheses x plus 1 close parentheses end fraction in partial fractions.

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23 marks

Express

fraction numerator 6 x minus 13 over denominator x squared minus 5 x plus 6 end fraction

in partial fractions.

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33 marks

Express  fraction numerator 7 x plus 34 over denominator x squared plus 9 x plus 14 end fraction  in partial fractions.

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43 marks

Express  fraction numerator 12 over denominator x squared plus 4 x minus 5 end fraction  in partial fractions.

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53 marks

Express  fraction numerator 2 x over denominator x squared minus 9 x minus 52 end fraction  in partial fractions.

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6
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3 marks

Express

fraction numerator 3 x plus 8 over denominator open parentheses x plus 1 close parentheses squared end fraction

in the form

fraction numerator A over denominator x plus 1 end fraction plus B over open parentheses x plus 1 close parentheses squared

where A spaceand B are integers to be found.

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73 marks

Express  fraction numerator 3 x plus 11 over denominator x squared plus 6 x plus 9 end fraction  in partial fractions.

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8a3 marks

Express

fraction numerator 3 x plus 7 over denominator x squared plus 4 x plus 3 end fraction

in partial fractions.

8b3 marks

Hence, show that

fraction numerator x squared plus x minus 4 over denominator x squared plus 4 x plus 3 end fraction identical to K minus fraction numerator 2 over denominator x plus 1 end fraction minus fraction numerator 1 over denominator x plus 3 end fraction

where K is a constant to be found.

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94 marks

Write

fraction numerator 12 x space minus space 6 over denominator open parentheses x minus 3 close parentheses open parentheses x plus 2 close parentheses open parentheses x minus 1 close parentheses end fraction

in the form 

fraction numerator A over denominator x minus 3 end fraction plus fraction numerator B over denominator x plus 2 end fraction plus fraction numerator C over denominator x minus 1 end fraction

 where A, B and C are integers to be found.

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10a2 marks

A function is given by

straight f left parenthesis x right parenthesis equals x cubed minus 13 x plus 12

(i) Show that straight f left parenthesis 1 right parenthesis equals 0.

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

10b2 marks

(i) Show that straight f left parenthesis 3 right parenthesis equals 0.

(ii) Hence write down a second factor of straight f left parenthesis x right parenthesis.

10c2 marks

Fully factorise straight f left parenthesis x right parenthesis.

10d4 marks

Express  fraction numerator 3 x squared minus 13 over denominator x cubed minus 13 x plus 12 end fraction  in partial fractions.

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11a1 mark

A function is given by

straight f left parenthesis x right parenthesis equals x cubed plus 3 x squared minus 4 x minus 12

Find straight f left parenthesis negative 3 right parenthesis.

11b3 marks

Factorise straight f left parenthesis x right parenthesis.

Give your answer in the form

straight f open parentheses x close parentheses equals open parentheses x plus p close parentheses open parentheses x plus q close parentheses open parentheses x minus q close parentheses

where p and q are integers to be found.

11c3 marks

Hence, express

fraction numerator 3 x squared minus 8 x minus 36 over denominator x cubed plus 3 x squared minus 4 x minus 12 end fraction

in partial fractions.

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14 marks

fraction numerator 1 plus 11 x minus 6 x squared over denominator open parentheses x minus 3 close parentheses open parentheses 1 minus 2 x close parentheses end fraction identical to A plus fraction numerator B over denominator open parentheses x minus 3 close parentheses end fraction plus fraction numerator C over denominator open parentheses 1 minus 2 x close parentheses end fraction

Find the values of the constants A, B and C.

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24 marks

straight f open parentheses x close parentheses equals fraction numerator 50 x squared plus 38 x plus 9 over denominator open parentheses 5 x plus 2 close parentheses squared open parentheses 1 minus 2 x close parentheses end fraction space space space space space x not equal to negative 2 over 5 space space space x not equal to 1 half

Given that straight f open parentheses x close parentheses can be expression in the form

fraction numerator A over denominator 5 x plus 2 end fraction plus B over open parentheses 5 x plus 2 close parentheses squared plus fraction numerator C over denominator 1 minus 2 x end fraction

where A, B and C are constants,

(i) find the value of B and the value of C,

(ii) show that A equals 0.

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3a2 marks

Write

 fraction numerator x squared plus x plus 5 over denominator x squared plus 3 x plus 2 end fraction

in the form

A minusfraction numerator 2 x minus 3 over denominator open parentheses x plus 1 close parentheses open parentheses x plus 2 close parentheses end fraction  

where A is an integer to be found.

3b3 marks

Express fraction numerator 2 x space minus space 3 over denominator open parentheses x plus 1 close parentheses open parentheses x plus 2 close parentheses end fraction  in the form  fraction numerator B over denominator x plus 1 end fraction plus fraction numerator C over denominator x plus 2 end fraction  where B spaceand C are integers to be found.

3c1 mark

Hence, write

fraction numerator x squared plus x plus 5 over denominator x squared plus 3 x plus 2 end fraction

  in the form

 P plus fraction numerator Q over denominator x plus 1 end fraction plus fraction numerator R over denominator x plus 2 end fraction

where P, Q and R are integers to be found.

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4a2 marks

Write

left parenthesis x squared plus 4 x minus 6 right parenthesis divided by left parenthesis x squared minus x minus 6 right parenthesis

in the form

P plus fraction numerator Q x over denominator x squared minus x minus 6 end fraction

where P and Q are integers to be found.

4b2 marks

Using your value of Q from part (a), write

fraction numerator Q x over denominator open parentheses x plus 2 close parentheses open parentheses x minus 3 close parentheses end fraction

  in the form 

fraction numerator A over denominator x plus 2 end fraction plus fraction numerator B over denominator x minus 3 end fraction

4c1 mark

Hence, write

fraction numerator x squared plus 4 x minus 6 over denominator x squared minus x minus 6 end fraction

as the sum of a constant and two partial fractions.

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5a1 mark

Show that left parenthesis x plus 1 right parenthesis is a factor of  x cubed minus 3 x squared plus 4.

5b2 marks

Factorise fully x cubed minus 3 x squared plus 4.

5c4 marks

Hence, express

fraction numerator 19 minus 8 x over denominator x cubed minus 3 x squared plus 4 end fraction 

in partial fractions.

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64 marks

Write

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

in the form

A over x plus fraction numerator B over denominator x minus 1 end fraction plus fraction numerator C over denominator x minus 2 end fraction

where A, B and C are integers to be found.

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75 marks

Express

fraction numerator 5 x squared plus 10 x plus 8 over denominator x open parentheses x plus 2 close parentheses squared end fraction

in partial fractions.

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85 marks

Express  fraction numerator 2 x squared plus 16 x minus 24 over denominator x cubed minus 2 x squared minus 8 x end fraction  in partial fractions.

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9a1 mark

Show that left parenthesis x minus 2 right parenthesis is a factor of  x cubed plus 4 x squared minus 3 x minus 18.

9b3 marks

Factorise fully x cubed plus 4 x squared minus 3 x minus 18.

9c4 marks

Express 

fraction numerator 7 x squared plus 32 x plus 8 over denominator x cubed plus 4 x squared minus 3 x minus 18 end fraction

in the form

fraction numerator A over denominator x minus 2 end fraction plus fraction numerator B over denominator x plus p end fraction plus C over open parentheses x plus p close parentheses squared

where A, B, C and p are integers to be found.

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104 marks

Express fraction numerator 8 over denominator x cubed minus 6 x squared plus 8 x end fraction in partial fractions.

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115 marks

Write

fraction numerator 13 x squared minus 10 over denominator x cubed minus x squared minus 2 x end fraction 

in the form 

A over x plus fraction numerator B over denominator x plus 1 end fraction plus fraction numerator C over denominator x minus 2 end fraction 

where A, B and C are integers to be found.

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124 marks

Write 

fraction numerator x squared plus 3 x plus 10 over denominator x squared plus 8 x plus 15 end fraction

in the form 

A plus fraction numerator B over denominator x plus 3 end fraction plus fraction numerator C over denominator x plus 5 end fraction

where A comma B spaceand C are integers to be found.

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134 marks

Express fraction numerator x squared minus 3 over denominator open parentheses x minus 3 close parentheses open parentheses x plus 2 close parentheses squared end fraction in partial fractions.

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14a3 marks

A function is given by

straight f left parenthesis x right parenthesis equals x cubed plus 3 x squared minus 4 x minus 12

By finding straight f left parenthesis negative 3 right parenthesis, or otherwise, fully factorise straight f left parenthesis x right parenthesis.

14b4 marks

Express

fraction numerator 3 x squared minus 8 x minus 36 over denominator straight f open parentheses x close parentheses end fraction

in partial fractions.

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13 marks

straight f open parentheses x close parentheses equals fraction numerator 3 k x minus 18 over denominator open parentheses x plus 4 close parentheses open parentheses x minus 2 close parentheses end fraction where k is a positive constant

Express straight f open parentheses x close parentheses in partial fractions in terms of k.

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26 marks

Express

fraction numerator 3 x squared minus 22 x plus 25 over denominator x cubed minus 7 x squared plus 8 x plus 16 end fraction

in partial fractions.

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36 marks

Express

fraction numerator x squared minus 5 over denominator x cubed minus x squared minus 17 x minus 15 end fraction 

in partial fractions.

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45 marks

Write

fraction numerator 34 minus 3 x squared minus x over denominator x cubed minus 5 x squared plus 3 x plus 9 end fraction

in the form 

fraction numerator A over denominator x plus 1 end fraction plus fraction numerator B over denominator x minus k end fraction plus C over open parentheses x minus k close parentheses squared 

where A, B, C and k are integers to be found.

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56 marks

Express 

fraction numerator 2 x squared minus 3 over denominator x cubed plus 4 x squared minus 3 x minus 18 end fraction 

in partial fractions.

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67 marks

Express 

fraction numerator 2 x minus 5 over denominator x cubed minus 3 x squared minus 13 x plus 15 end fraction 

in partial fractions.

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75 marks

Express 

fraction numerator 2 open parentheses 3 x cubed plus x squared minus 17 x plus 4 close parentheses over denominator x open parentheses x minus 1 close parentheses open parentheses x minus 4 close parentheses open parentheses x plus 2 close parentheses end fraction 

in partial fractions.

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87 marks

Given that 

x to the power of 4 minus 4 x cubed minus 2 x squared plus 12 x plus 9 identical to left parenthesis x squared minus 6 x plus 9 right parenthesis left parenthesis x squared plus 2 x plus 1 right parenthesis

express 

fraction numerator 5 x cubed minus 15 x squared plus 19 x plus 7 over denominator x to the power of 4 minus 4 x cubed minus 2 x squared plus 12 x plus 9 end fraction

in partial fractions.

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