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)=x2−4x+5.
The function can also be expressed in the form f(x)=(x−h)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)2−4(2)+5
k=1 A1 N2
METHOD 2
valid attempt to complete the square (M1)
egx2−4x+4
correct working (A1)
eg(x2−4x+4)−4+5, (x−2)2+1
k=1 A1 N2
[4 marks]
Examiners report
[N/A]