nomor 12 dan 13 beserta caranya..

no 12=(10x^2-2xy+2y^2)-(2x^2+xy+3y^2)
=10x^2-2x^2-2xy+xy+2y^2+3y^2
=8x^2-xy+5y^2 [D]
mf no 13 msh ragu :)

No. 12
10x²-2xy+2y²-2x²-xy+3y²
=10x²-2x²-2xy-xy+2y²+3y²
=8x²-3xy+5y²
Yg C
No. 13
7xy²-3xy²-9x²y+5x²y+11xy-7xy
=4xy²-4x²y+4xy
=4(xy²-x²y+xy)
Yg A