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Date November 2019 Marks available 3 Reference code 19N.1.SL.TZ0.S_3
Level Standard Level Paper Paper 1 (without calculator) Time zone Time zone 0
Command term Find Question number S_3 Adapted from N/A

Question

Let  g ( x ) = x 2 + b x + 11 . The point  ( 1 8 )  lies on the graph of g .

Find the value of b .

[3]
a.

The graph of  f ( x ) = x 2  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 ,   1 b + 11 = 8

b = 4         A1  N2

[3 marks]

a.

valid attempt to solve     (M1)

eg    ( x 2 + 4 x + 4 ) + 7 ,   h = 4 2 ,   k = g ( 2 )

correct working        A1

eg     ( x + 2 ) 2 + 7 ,   h = 2 ,   k = 7

translation or shift (do not accept move) of vector  ( 2 7 )  (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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