SOLUTION: Which numbers cannot be used in place of the variable in the rational expression? 3x/x^2-49

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Question 314357: Which numbers cannot be used in place of the variable in the rational expression?
3x/x^2-49
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
%283x%29%2F%28x%5E2-49%29=3x%2F%28%28x-7%29%28x%2B7%29%29
Two values are not allowed.
x=7 and x=-7.
They are not allowed since then you would have a division by zero which is undefined.
+graph%28+300%2C+300%2C+-10%2C+10%2C+-3%2C+3%2C+3x%2F%28x%5E2-49%29x-2%29+