Question

If f(x)= 2x+8 and g(x) = x^4, what is (g°f)(-3)?

Answer 1

g(f(x))=(2x+8)^4=>g(f(-3))=(2(-3)+8)^4=(-6+8)^4=(+2)^4=16

Answer 2

To answer this question, first you need to find the (g°f) function. It will be found by inserting the f(x) into g(x). It should be: 
g(x) = x^4
(g°f)(x)= (2x+8)^4
(g°f)(-3)= (2*-3+8)^4
(g°f)(-3)= (8-6)^4= 2^4= 16