Posted by ted on Thursday, July 5, 2012 at 10:47pm.
looks like grouping might be the simplest way ...
X^3+X^2-9X-9
= x^2(x+1) - 9(x+1)
= (x+1)(x^2-9) and now I see a difference of squares
= (x+1)(x+1)(x-1)
or
= (x-1)(x+1)^2
or, noting the "9" :-)
(x-1)(x-3)(x+3)
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