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posted by Anne on Monday, August 13, 2012 at 11:02am.

(a^2 - 4a)/(a^2-a-6) minus (a-6)/a^2-a-6)

combine terms to get (a^2 - 4a - a + 6)/(a^2-a-6) = (a^2-5a+6)/(a^2-a-6) = (a-3)(a-2)/((a-3)(a+2)) = (a-2)/(a+2) if a≠3

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