Question

Help please if you can?
If f(x) = -2x - 5 and g(x) = x^4 what is (gºf)(-4)

Answer 1

81

Explanation:

g(x) = x^4 put f(x) in for x in g(x)

g(f(x)) = (f(x))^4 Substitute the value for f(x) which is (-2x - 5) put - 4 in for the x in f(x)

g(f(x) = (-2x - 5)^4

g(f(x)) = (- 2*(- 4) - 5)^4 Combine

g(f(x)) = (8 - 5)^4 Subtract

g(-4) = (3)^4 Raise 3 to the 4th power

g(-4) = 81 Answer.