Please help me solve this difficult math question

[From: ] [author: ] [Date: 12-06-02] [Hit: ]

Y=(-1/3)x^3-
(1/2)x^2-2x.......please find the
intervals of increase and
decrease......please help me...

y ' > 0 ---> y is increasing
and
y ' < 0 ----> y is decreasing

keywords: help,this,Please,solve,math,difficult,me,question,Please help me solve this difficult math question