Posted by **bill** on Thursday, November 2, 2006 at 2:44pm.

someone please help me understand how this is done.state all the restritions on the variable 7x-13/x^2-16

Your problem:

7x - 13

-------

x^2 - 16

The restrictions are that x cannot equal 4 or -4.

The denominator of a fraction cannot equal 0.

I hope this helps and is what you were asking.

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