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  4. Let f:[-1,3] arrow[-8,72] be defined as f(x)=4 x3-12 x, then f is

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Q. Let $f:[-1,3] \rightarrow[-8,72]$ be defined as $f(x)=4 x^3-12 x$, then $f$ is

Relations and Functions - Part 2

Solution:

$f(x)=4 x^3-12 x$
$f^{\prime}(x)=12\left(x^2-1\right)=12(x+1)(x-1)$

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