Posted by roshunda on Sunday, May 22, 2011 at 9:29pm.
use "grouping"
b^3-4b^2-9b+36
= b^2(b-4) - 9(b-4)
= (b-4)(b^2-9)
= (b-4)(b+3)(b-3)
x3 + 2x2 + x + 2
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