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December 21, 2014

December 21, 2014

Posted by **amy** on Thursday, May 22, 2008 at 2:45pm.

For this function there are four important intervals: (-inf,–A], [A,B),(B,C), and [C,inf)

where A, and C are the critical numbers and the function is not defined at B.

Find A= ?????

and B= 0

and C =?????

- calculus help please -
**amy**, Thursday, May 22, 2008 at 3:08pmi have this one already

- calculus help please -
**drwls**, Thursday, May 22, 2008 at 4:06pmIn that case I will assume that you no longer need help.

Since f(x) = 2x + 9/x

f'(x) = 2 - 9/x^2

The function has extreme values at

x = 3/sqrt2 and = -3/sqrt2

Those are the points A and C.

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