Answer
$ x=0$ and $ x= 4$
Work Step by Step
Given $$ f(x) =6 x^2-x^3$$
Then to find the critical points
\begin{align*}
f'(x)&=0\\
12x-3x^2&=0
\end{align*}
Hence the critical points are $ x=0$ and $ x= 4$
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