# How do you find the interval in which the function #f(x)=2x^3 + 3x^2+180x# is increasing or decreasing?

##### 1 Answer

Mar 6, 2015

It is increasing on the whole real line. (On the interval

A differentiable function is increasing on any interval on which its derivative is positive.

For the function is question,

(Use the quadratic formula to solve

In fact, this derivative is always positive.

Therefore,