SOLUTION: please help me Find all numbers for which the rational expression is undefined. m^3-7m / m^2-81 "use comma to separate answers"

Question 359031: please help me

Find all numbers for which the rational expression is undefined.

m^3-7m / m^2-81

"use comma to separate answers"
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Find all numbers for which the rational expression is undefined.
m^3-7m / m^2-81
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The denominator cannot be zero.
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Solve m^2-81 = 0
(m-9)(m+9) = 0
m = 9 or m = -9
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The expression is undefined for m = 9 and for m = -9.
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Cheers,
Stan H.
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