Posted by Rochelle on Wednesday, January 11, 2012 at 7:46pm.
(y+2)y = y^2+2y.
y^2+2y-(y^2-49)(y^2-6y+7) =
y^2+2y-(y^4-6y^3+7y^2-49y^2+294y-343)=y^2+2y-y^4+6y^3-7y^2+49y^2-294y+343=
-y^4+6y^3+43y^2-292y+343.
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