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

Consider the function f(x)=2x+9x^–1.?

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 =?????

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