Posted by Angelina on Friday, March 9, 2012 at 1:38am.
2x^3+3x^2120x
to find the critical numbers I took the derivative which is 6x^2+6x120 so divide by 6 to simplify
x^2+x20=0
so the critical numbers will be (4,0) and (5,0) but its wrong I don't know y?

Math  Steve, Friday, March 9, 2012 at 1:33pm
Your work looks good to me, but the critical numbers are 4 and 5, not the points you give.
Recall the definition:
A number a in the domain of a given function f is called a critical number of f if f '(a) = 0 or f' is undefined at x = a.

Math  Angelina, Friday, March 9, 2012 at 2:53pm
Thnks :)
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