Posted by lisa on Friday, February 22, 2008 at 10:47am.
What have written is ambiguous unless you insert parentheses where they are needed to explain the order of operation.
If you mean
x^2/(x-3) -9/(x-3) ,
then rewrite it as
(x^2-9)/(x-3) = (x+3)(x-3)/(x-3) = x+3
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