SOLUTION: identify all numbers for which rational expression is undefined r^3-6r / r^2-25

SOLUTION: identify all numbers for which rational expression is undefined r^3-6r / r^2-25

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Question 510145: identify all numbers for which rational expression is undefined r^3-6r / r^2-25
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
This expression is undefined when the denominator equals zero, so set the denominator equal to zero and solve for r.
Add 25 to both sides.
Take the square root of both sides.
or
The expression is undefined for r = 5 and r = -5.
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