SOLUTION: Find all numbers for which the rational experssion is undefined. t^3-7t/t^2-81 Thanks for the help

SOLUTION: Find all numbers for which the rational experssion is undefined. t^3-7t/t^2-81 Thanks for the help

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Question 203910: Find all numbers for which the rational experssion is undefined.
t^3-7t/t^2-81
Thanks for the help
Answer by RAY100(1637) (Show Source): You can put this solution on YOUR website!
(t^3 -7t) / (t^2-81)
.
undefined if denominator is zero
.
t^2-81 = (t+9)(t-9) =0,,,t=+9,,-9
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