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Date November 2016 Marks available 2 Reference code 16N.1.SL.TZ0.T_9
Level Standard Level Paper Paper 1 Time zone Time zone 0
Command term Find Question number T_9 Adapted from N/A

Question

The graph of the quadratic function f ( x ) = c + b x x 2 intersects the x -axis at the point A ( 1 ,   0 ) and has its vertex at the point B ( 3 ,   16 ) .

N16/5/MATSD/SP1/ENG/TZ0/09

Find the value of b .

Markscheme

b 2 ( 1 ) = 3    (M1)

 

Note:     Award (M1) for correct substitution into axis of symmetry formula.

 

OR

b 2 x = 0    (M1)

 

Note:     Award (M1) for correctly differentiating and equating to zero.

 

OR

c + b ( 1 ) ( 1 ) 2 = 0 (or equivalent)

c + b ( 3 ) ( 3 ) 2 = 16 (or equivalent)     (M1)

 

Note:     Award (M1) for correct substitution of ( 1 ,   0 ) and ( 3 ,   16 ) in the original quadratic function.

 

( b = )   6    (A1)(ft)     (C2)

 

Note:     Follow through from part (a).

 

[2 marks]

Examiners report

[N/A]

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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