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Date May 2021 Marks available 3 Reference code 21M.1.AHL.TZ2.2
Level Additional Higher Level Paper Paper 1 Time zone Time zone 2
Command term Find Question number 2 Adapted from N/A

Question

A function is defined by fx=2-12x+5 for -7x7, x-5.

Find the range of f.

[3]
a.

Find an expression for the inverse function f1(x). The domain is not required.

[3]
b.

Write down the range of  f1(x).

[1]
c.

Markscheme

f-7= 8 and f7= 1           (A1) 

range is fx1, fx8           A1A1 


Note: Award at most A1A1A0 if strict inequalities are used.


[3 marks]

a.

interchanging x, y at any stage           (A1) 

y=2-12x+5

12x+5=2-y

122-y=x+5          (A1) 

122-y-5=x

 f1(x)= 122-x-5  =2+5x2-x          A1


[3 marks]

b.

range is -7f-1x7,  f-1x-5          A1


[1 mark]

c.

Examiners report

[N/A]
a.
[N/A]
b.
[N/A]
c.

Syllabus sections

Topic 2—Functions » SL 2.2—Functions, notation domain, range and inverse as reflection
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Topic 2—Functions » AHL 2.7—Composite functions, finding inverse function incl domain restriction
Topic 2—Functions

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