SOLUTION: Find all numbers for which the rational expression is undefined. p^3 - 9p/p^2 -81

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Question 307265: Find all numbers for which the rational expression is undefined.
p^3 - 9p/p^2 -81
Answer by rapaljer(4671) About Me  (Show Source):
You can put this solution on YOUR website!
A rational expression will be undefined if the denominator is zero!! The problem here is to find all values for which the denominator is zero. (The numerator is actually irrelevant!) This means that
p%5E2+-81=0
%28p-9%29%28p%2B9%29=0
p=9 or p=-9

Dr. Robert J. Rapalje, Retired