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2015-08-24T21:54:36+08:00
2015-08-24T21:56:27+08:00

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Example. The following cancellation is valid for  :If  , then the common factor  is equal to 0, so in that case it is like simplifying  to get 1 (which isn't right).Notice that the original expression  is undefined if  (since  makes the bottom 0), but the final expression  is defined when  (it's equal to 2).
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