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Date November 2016 Marks available 4 Reference code 16N.1.SL.TZ0.S_1
Level Standard Level Paper Paper 1 (without calculator) Time zone Time zone 0
Command term Write down and Find Question number S_1 Adapted from N/A

Question

Let f(x)=x24x+5.

The function can also be expressed in the form f(x)=(xh)2+k.

(i)     Write down the value of h.

(ii)     Find the value of k.

Markscheme

(i)     h=2     A1     N1

(ii)     METHOD 1

valid attempt to find k     (M1)

egf(2)

correct substitution into their function     (A1)

eg(2)24(2)+5

k=1     A1     N2

METHOD 2

valid attempt to complete the square     (M1)

egx24x+4

correct working     (A1)

eg(x24x+4)4+5, (x2)2+1

k=1     A1     N2

[4 marks]

Examiners report

[N/A]

Syllabus sections

Topic 2—Functions » SL 2.6—Quadratic function
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