The equation of the graph is $$ y = -x^2 + 9x - 18 $$
From the graph sketched, find the range of values of $x$ for which $x^2 + 18 > 9x$.
Workings $$ y = -(x-3)(x-6) $$
I'm not sure what is the question asking ... Can I get a hint? Thanks for your help!
Hint:
note that:
$9x<x^2-18 \iff -x^2+9x-18<0$
and look at your graph.