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example of rational expressions

Sagot :

x+y over x+y yan ang sagot
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).