Posted by **mkcolema** on Tuesday, March 17, 2009 at 11:34am.

8.

f(x)= - 2x^3 + 45x^2 -300x +9

There are 3 intervals (-inf,A], [A,B], [B, inf) where A and B are critical points.

Find A and B?

For each of the intervals is it decreasing or increasing??

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