Question

find the values of x where the extreme values of the function y=x^3-7x-5x occur.

Answer 1

http://www.wolframalpha.com/input/?i=y%3Dx^3-7x-5x+find+the+value+of+x+extrem

Answer 2

(a) x=-0.33, x=5
(b) x=0.33, x=-5
(c) x=0.33, x=5
(d) x=2, x=5
(e) x=0.65 ,x=7.65