If $f(u) = 7 + 3u - 3u^2$, find $f'(-5)$.
Which is the correct method for finding $f'(-5)$?
Substitute -5 into $f(u)$ for $u$
Substitute -5 into $f(u)$ for $u$ and then find the derivative
Find the derivative of $f(u)$ and then substitute -5 into $f'(u)$ for $u$
Multiply $f(u)$ with -5