SOLUTION: I need to find what numbers cannot be used in place of th vaiable in this rational expression. 3x/x^2-49

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Question 402234: I need to find what numbers cannot be used in place of th vaiable in this rational expression.
3x/x^2-49
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
The value(s) of x that would make the denominator zero would be the "excluded" value(s).
3x%2F%28x%5E2-49%29 Set the denominator equal to zero and solve for x.
x%5E2-49+=+0 Factor.
%28x%2B7%29%28x-7%29+=+0 so...
x+=+-7 and x+=+7 would be the excluded values.