SOLUTION: find all numbers for which the rational expression is undefined (r^3-3r)/(r^2-81) Thank you for your help!

SOLUTION: find all numbers for which the rational expression is undefined (r^3-3r)/(r^2-81) Thank you for your help!

Algebra.Com

Question 144599: find all numbers for which the rational expression is undefined
(r^3-3r)/(r^2-81)
Thank you for your help!
Answer by vleith(2983) (Show Source): You can put this solution on YOUR website!
The expression is undefined whenever the a value for r results in a denominator with the value .
Set and solve for r.

and
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