intervals of increase and the intervals of decrease?

y=-(x-3)^5(x+1)^4

For this function currently i have:

degree: 9

**sign**: negative ???

quadrants: I, II and 4

Roots: x=3 and -1

y-intercept= 243

domain: x belongs to E

range: y belongs to E

**INTERVALS of INCREASE** : ???

**INTERVALS of DECREASE** : ???

End Behaviors: As x approaches -infinity, y approaches infinity

as x approaches infinity, y approaches -infinity.

For the function y=-(x-3)^5(x+1)^4 what are the intervals of increase and the intervals of decrease?