I am having a test the day right after spring break and throughout this time i don't know where to look for help, so i hope someone can help me with this problem

Suppose that a certain population is modeled by the following Differential Equation: dP/dt = 2P(P/120-2)

For what values of P is decreasing? For what values of P is increasing?

I tried to solve the D.E. by setting all the P's on one side but that didnt seem to work at all