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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+bxx2 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

b2(1)=3    (M1)

 

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

 

OR

b2x=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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