Please explain: f'(x) = f'(g(x)) * g'(x) Note: f'(g(x)) = 3g(x)^2. You can then substitute 5 for x and simplify.?

I have solved and got 75 that is wrong, 30 is wrong, and 225 is wrong. Can someone please explain how to solve?

2017-04-11T00:37:33.809Z