Posted by **Katie** on Friday, October 28, 2011 at 12:40pm.

find all numbers for which the rational expression is undefinded

8/8z+7

I think the expression is undefined for all real numbers

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**Steve**, Friday, October 28, 2011 at 12:46pm
If the fraction is 8/(8z) + 7 you are right.

If it is 8/(8z+7) then the answer is different.

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**Steve**, Friday, October 28, 2011 at 12:47pm
Oops. If 8/(8z) + 7, then it is undefined only for z=0

In general, a rational expression is undefined where the denominator is zero.

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**KATIE A**, Friday, October 28, 2011 at 12:48pm
Thank you steve

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**Steve**, Friday, October 28, 2011 at 12:53pm
My pleasure. Now, go forth and solve similar problems with confidence!

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**Katie**, Friday, October 28, 2011 at 12:56pm
I will try my best

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