SOLUTION: Find all the numbers for which the rational expression is undefined. r^3-2r/r^2-81 the numbers for which the rational expression is undefined are?

Question 297202: Find all the numbers for which the rational expression is undefined.
r^3-2r/r^2-81
the numbers for which the rational expression is undefined are?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
The expression is undefined if the denominator is 0
So anything that makes the denominator zero makes the expression undefined.
I can't tell if the denominator is r^2 or r^-81
if it is r^2-81 then r^2 can't equal 81

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