# help

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find all numbers for which the rational expression is undefinded

8/8z+7

I think the expression is undefined for all real numbers

• help -

If the fraction is 8/(8z) + 7 you are right.

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

• help -

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.

• help -

Thank you steve

• help -

My pleasure. Now, go forth and solve similar problems with confidence!

• help -

I will try my best

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