find f'(5) given :?

f(x)= (g(x))^3
g(5)=-3, g'(5)= 6

f'(x) = 3(g(x))^2 * g'(x)
f'(5) = 3(g(5))^2 * g'(5) = what?

2017-04-11T00:37:33.809Z