So you have either or
Y= 6x^3-x^4
I need to find where the intervals are increasing and decreasing and also the relative max and min. I know I have to find the derivative first which is Y'= 18x^2-4x^3. I need to set this equal to zero to find the critical values, but I'm having a little trouble here. If anyone can help I would appreciate it!!!!!! Thanks!