Question 0118

Equations and Inequalities
2018 Paper 1 Question 4 Variant

Question

(i)
Find the exact roots of the equation
x2x7=72x|x^2 - x - 7| = 7 - 2 x
[4]
(ii)
On the same axes, sketch the curves with equations y=x2x7{y=|x^2 - x - 7|} and y=72x.{y=7 - 2 x.}
Hence solve the inequality
x2x7>72x.|x^2 - x - 7| > 7 - 2 x.
[4]

Answer