SOLUTION: When solving a rational equation, why is it necessary to perform a check?

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Question 434680: When solving a rational equation, why is it necessary to perform a check?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
Because sometimes when you have "multiple" possible solutions, one or more may not work or do not make sense -- these are called "extraneous" solutions -- they must be thrown out.