# Thread: when is function increasing/decreasing

1. ## when is function increasing/decreasing

Solve without calculator:

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

2. Originally Posted by IronMan21
Solve without calculator:

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

Do you know how to take the derivative ?

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