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

Question

h(x)=(7-2x)^2

suppose that g(x)=7-2x

f(x)=??

Answer 1

h(x) = (7-2x)^2

g(x) = 7-2x

h(x) = f(g(x)) what is f(x)??

h = f(g) =g^2 = f(7-2x) =(7-2x)^2

f(x) =x^2