Date | May 2019 | Marks available | 5 | Reference code | 19M.1.AHL.TZ2.H_3 |
Level | Additional Higher Level | Paper | Paper 1 | Time zone | Time zone 2 |
Command term | Express | Question number | H_3 | Adapted from | N/A |
Question
Consider the function f(x)=x4−6x2−2x+4, x∈R.
The graph of f is translated two units to the left to form the function g(x).
Express g(x) in the form ax4+bx3+cx2+dx+e where a, b, c, d, e∈Z.
Markscheme
* This question is from an exam for a previous syllabus, and may contain minor differences in marking or structure.
g(x)=f(x+2)(=(x+2)4−6(x+2)2−2(x+2)+4) M1
attempt to expand (x+2)4 M1
(x+2)4=x4+4(2x3)+6(22x2)+4(23x)+24 (A1)
=x4+8x3+24x2+32x+16 A1
g(x)=x4+8x3+24x2+32x+16−6(x2+4x+4)−2x−4+4
=x4+8x3+18x2+6x−8 A1
Note: For correct expansion of f(x−2)=x4−8x3+18x2−10x award max M0M1(A1)A0A1.
[5 marks]