Jawabanmu

2014-09-13T20:38:47+07:00
P + 2Q -5P = 2Q - 4P
= 2(4x-2y) - 4(2x+3y) 
= 8x- 4y -8x - 12y
= - 16y
2014-09-13T20:51:37+07:00
P+2Q-5P = (2x+3y)+2(4x-2y)-5(2x+3y)=
2x+3y+8x-4y-10y-15y
2x+8x-10x+3y-4y-15y
= -16y