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Date November 2019 Marks available 4 Reference code 19N.1.SL.TZ0.S_3
Level Standard Level Paper Paper 1 (without calculator) Time zone Time zone 0
Command term Describe Question number S_3 Adapted from N/A

Question

Let g(x)=x2+bx+11. The point (18) lies on the graph of g.

Find the value of b.

[3]
a.

The graph of f(x)=x2 is transformed to obtain the graph of g.

Describe this transformation.

[4]
b.

Markscheme

valid attempt to substitute coordinates      (M1)

eg    g(1)=8

correct substitution      (A1)

eg    (1)2+b(1)+11=8,  1b+11=8

b=4        A1  N2

[3 marks]

a.

valid attempt to solve     (M1)

eg    (x2+4x+4)+7,  h=42,  k=g(2)

correct working        A1

eg    (x+2)2+7,  h=2,  k=7

translation or shift (do not accept move) of vector (27) (accept left by 2 and up by 7)        A1A1  N2

[4 marks]

b.

Examiners report

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

Syllabus sections

Topic 2—Functions » SL 2.3—Graphing
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Topic 2—Functions » SL 2.6—Quadratic function
Topic 2—Functions » SL 2.11—Transformation of functions
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