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

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Question 367516: which numbers cannot be used in place of the variable in the rational expression:
3x/x^2-49
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
3x%2F%28x%5E2-49%29+=+3x%2F%28%28x-7%29%28x%2B7%29%29. So the numbers x = 7 or x = -7 cannot be used into the expression.