Jawabanmu

2014-08-12T16:38:26+07:00
y³ - (2-y³) + (3y²-2y) - (y-4y²)
=y
³+2+y³+3y²-2y-y+4y²
=y³+y³+3y²+4y²-2y-y+2
=2y³+7y²-3y+2