Jawabanmu

2014-09-07T18:22:10+07:00
(2X +5y²) - (3x-9y²+3)
=2x(3x-9y²+3)+5y(-3x-9y²+3)
=6x²-18xy²+6x-15xy-45y³+15y

(x²- 5y²) - (-2x+3y+4xy)
=(x²- 5y²) + (2x+3y+4xy)
=x² (2x+3y+4xy) -5y² (2x+3y+4xy)
=2x³+3x²y+4x³y-10xy²-15y³-20xy³