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Date May 2021 Marks available 2 Reference code 21M.1.SL.TZ2.7
Level Standard Level Paper Paper 1 Time zone Time zone 2
Command term Find Question number 7 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 the value of f-10.

[2]
b.

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.

EITHER

sketch of f and y=0 or sketch of f-1 and x=0               (M1)


OR

finding the correct expression of f-1x=-2-5xx-2               (M1)


OR

f-10=-2-500-2              (M1)


OR

fx=0              (M1)


THEN

f-10=1           A1


[2 marks]

b.

Examiners report

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

Syllabus sections

Topic 2—Functions » SL 2.2—Functions, notation domain, range and inverse as reflection
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Topic 2—Functions

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