Let f(x)=5x-4 and g(x)=x+7

Question

A. (fog)x

B.(gof)x

c.(fog)(3)

Answer 1

A  (fog)(x) = f(g(x)) = 5(g(x))-4 = 5(x+7) - 4 = Simplify here.

 

B  Same thing but reverse the f and g

 

C  Use part A but substitute 3 in for x