Find f(x) and g(x) such that h(x) =(f o g)(x)

Question

given h(x)=(2x+8)^7

Answer 1

If you have f(x) = x^7
then let g(x) = 2x+8
That makes (fog) = f(g) = g^7 = (2x+8)^7
Take the outermost operator as the outermost function.