Question

Let f(x) = 3x +5 and g(x) = -4x +7. Find (fog)(-4)

Answer 1

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

f(g(x))=3(-4x+7)+5
f(g(-4))=3(-4(4)+7)+5=3(-16+7)+5=3(-9)+5=-27+5=-22


(fog)(-4)=-22