Posted by **lelani** on Tuesday, January 30, 2007 at 5:56pm.

a^2-2ab-15b^2

a^2-2ab-15b^2 =

(a - b)^2 - 16 b^2 =

[a - b + 4 b]* [a - b - 4b] =

(a + 3b)*(a - 5b)

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