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Date May 2017 Marks available 2 Reference code 17M.1.hl.TZ2.2
Level HL only Paper 1 Time zone TZ2
Command term Find Question number 2 Adapted from N/A

Question

The function \(f\) is defined by \(f(x) = 2{x^3} + 5,{\text{ }} - 2 \leqslant x \leqslant 2\).

Write down the range of \(f\).

[2]
a.

Find an expression for \({f^{ - 1}}(x)\).

[2]
b.

Write down the domain and range of \({f^{ - 1}}\).

[2]
c.

Markscheme

\( - 11 \leqslant f(x) \leqslant 21\)     A1A1

 

Note:     A1 for correct end points, A1 for correct inequalities.

 

[2 marks]

a.

\({f^{ - 1}}(x) = \sqrt[3]{{\frac{{x - 5}}{2}}}\)     (M1)A1

[2 marks]

b.

\( - 11 \leqslant x \leqslant 21,{\text{ }} - 2 \leqslant {f^{ - 1}}(x) \leqslant 2\)     A1A1

[2 marks]

c.

Examiners report

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

Syllabus sections

Topic 2 - Core: Functions and equations » 2.1
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