Subtract (a^2)/(a+9)-81/(a+9)

Math
Combine the numerators over the common denominator.
Simplify the numerator.
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Rewrite as .
Since both terms are perfect squares, factor using the difference of squares formula, where and .
Cancel the common factor of .
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Cancel the common factor.
Divide by .
Subtract (a^2)/(a+9)-81/(a+9)


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