Date | November 2021 | Marks available | 2 | Reference code | 21N.2.SL.TZ0.2 |
Level | Standard Level | Paper | Paper 2 | Time zone | Time zone 0 |
Command term | Find | Question number | 2 | Adapted from | N/A |
Question
Consider the function f(x)=e-x2-0.5, for -2≤x≤2.
Find the values of x for which f(x)=0.
[2]
a.
Sketch the graph of f on the following grid.
[3]
b.
Markscheme
x=-0.832554…, x=0.832554…
x=-0.833, x=0.833 A1A1
[2 marks]
a.
A1A1A1
Note: Award A1 for approximately correct shape. Only if this mark is awarded, award A1 for approximately correct roots and maximum point and A1 for approximately correct endpoints.
Allow -1<x≤-0.8, 0.8≤x<1 for roots, x=0, 0.4≤y≤0.6 for maximum and x=±2, -0.6≤y≤-0.4 for endpoints.
[3 marks]
b.
Examiners report
[N/A]
a.
[N/A]
b.