Question 0118

Equations and Inequalities
2018 Paper 1 Question 4 Variant

Question

(i)
Find the exact roots of the equation
2x22x9=92x|2 x^2 - 2 x - 9| = 9 - 2 x
[4]
(ii)
On the same axes, sketch the curves with equations y=2x22x9{y=|2 x^2 - 2 x - 9|} and y=92x.{y=9 - 2 x.}
Hence solve the inequality
2x22x9<92x.|2 x^2 - 2 x - 9| < 9 - 2 x.
[4]

Answer