8
(-3x^2 +4x^2+2x^2)3x+x(20x^2-(14x)2x+6x)
= 3x^2(3x) + x(20x^2 - 28x^2 + 6x)
= 9x^3 + x(-8x^2 + 6x)
= 9x^3 - 8x^3 + 6x^2
= x^3 + 6x^2
Added 6/22/2014 2:30:49 AM
This answer has been confirmed as correct and helpful.
Confirmed by
jeifunk [6/22/2014 2:40:22 AM]