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Date November 2016 Marks available 2 Reference code 16N.2.SL.TZ0.S_1
Level Standard Level Paper Paper 2 Time zone Time zone 0
Command term Find Question number S_1 Adapted from N/A

Question

Let f(x)=x2+2x+1 and g(x)=x5, for xR.

Find f(8).

[2]
a.

Find (gf)(x).

[2]
b.

Solve (gf)(x)=0.

[3]
c.

Markscheme

* This question is from an exam for a previous syllabus, and may contain minor differences in marking or structure.

attempt to substitute x=8     (M1)

eg82+2×8+1

f(8)=81    A1     N2

[2 marks]

a.

attempt to form composition (in any order)     (M1)

egf(x5), g(f(x)), (x2+2x+1)5

(gf)(x)=x2+2x4     A1     N2

[2 marks]

b.

valid approach     (M1)

eg     x=2±202N16/5/MATME/SP2/ENG/TZ0/01.c/M

1.23606, 3.23606

x=1.24, x=3.24     A1A1     N3

[3 marks]

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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