Answer:
........
Step-by-step explanation:
Answer: a
<em>solve for x </em>
x ≤ − 7
g(5x)=25x^2+7
Input 5x for x and achieve this answer.
(f(x+h)-f(x))/h=(9(x+h)^2+8x+8h+2-9x^2-8x-2)/h=(9x^2+18xh+h^2+8h-9x^2)/h=18+8+h
