Question 419567
"Simplify the rational expression.
(a^2 + 13a + 40) / (a^2 - 4a - 45)"


a^2 + 13a + 40
--------------
a^2 - 4a - 45


(a + 8)(a + 5)
-------------- {factored top and bottom into two binomials}
(a - 9)(a + 5)


a + 8
------ {cancelled a + 5 on top and bottom}
a - 9
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