Posted by Susan on Sunday, September 5, 2010 at 9:50am.
12r^2 +36rf +27f^2
= 3(4r^2 + 12rf + 9f^2)
= 3(2r+3f)(2r+3f) or 3(2r+3f)^2
5x^5-20x^4+30x^3
= 5x^3(x^2 - 4x + 6)
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