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# Use a graph to estimate the critical numbers of $f(x) = | 1 + 5x - x^3 |$ correct to one decimal place.

## Critical numbers where $f'(x)$ does not exist: $-2.1$, $-0.2$, and $2.3$.Critical numbers where $f'(x) = 0$: $-1.2$ and $1.2$.

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Derivatives

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