when is function increasing/decreasing

Solve without calculator:

when is $\displaystyle f(x)=x^4-3x^3+2x^2-2$ increasing/decreasing?

Quote:

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Originally Posted by IronMan21

Solve without calculator:

when is $\displaystyle f(x)=x^4-3x^3+2x^2-2$ increasing/decreasing?

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Hi

Do you know how to take the derivative ?

$\displaystyle f'(x)=4x^3-9x^2+4x=x(4x^2-9x+4)$