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The minimum value of the function f(x)=2...

The minimum value of the function `f(x)=2x^3-21 x^2+36 x-20` is
(a) `-128`
(b) `-126`
(c) `-120`
(d) none of these

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`-128`
Given:-
`f(x)=2 x^{3}-21 x^{2}+36 x-20 `
`Rightarrow f prime(x)=6 x^{2}-42 x+36`
...
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