Jawabanmu

2014-09-12T20:19:56+07:00
(y+4x)(2x-3y)-2x(y-2x)
= (2xy-3y²+8x²-12xy)-2xy+4x²
=12x²-3y²-12xy
1 4 1
2014-09-12T20:22:40+07:00
(y-3y-y) (4x + 2x - 2x + 2x)
=(-2y-y) (6x - 2x + 2x)
=3y + 6x