SOLUTION: For what values of the variable is the rational expression undefined? 4 _________ x2-9

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Question 313023: For what values of the variable is the rational expression undefined?
4
_________
x2-9
Answer by rapaljer(4671) About Me  (Show Source):
You can put this solution on YOUR website!
A rational expression is undefined if the denominator is zero. In this case, the denominator is
x^2 -9

Set this denominator equal to zero, factor the left side, and solve for x:
(x-3)(x+3)=0
x-3=0 or x+3=0
x=3 or x=-3

Dr. Robert J. Rapalje, Retired