Question

Can someone please help me solve this function?

Given f(x)=5x-8 and g(x)=x^2+4
Find (fog)(1) and (gof)(x)

Answer 1

(fog)(x) = f(g(x))


(fog)(x) = f(x^2+4)


(fog)(1) = f(1^2+4)


(fog)(1) = f(1+4)


(fog)(1) = f(5)


(fog)(1) = 5(5)-8


(fog)(1) = 25-8


(fog)(1) = 17