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Find the greatest and least values of f(x) `=x^(2) -12x " "X in [-1,3]`.

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The possible points of maxima`//`minima are critical points points and the boundary points. For ` X in [-1,3]" and " f(x) =x^(3) -12x`
`X=2` is the only critical point.
Examining the value of f(x) at points x =- 1,2,3 We can find greatest and least values.

`:.` Minimum f(x) =- 16 & Maximum f(x) =11.
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