hasil dan cara(8a+7b-3c)-(5a-3b+6c) dan 6x-7(2y-1)(2y-2) tolong ya bsok di kumpul....

(8a+7b-3c)-(5a-3b+6c)=8a-5a+7b+3b-3c-6c=3a+10b-9c

6x-7(2y-1)(2y-2) =6x(-7*2y-7*-1)(2y-2)
=6x+(-14y+7)(2y-2)
=6x+(-14y*2y-14y*-2+7*2y+7*-2)
=6x+(-28y^2+28y+14y-14)
=6x-28y^2+42y-14

ket: *:kali , ^ : pangkat

8a+7b-3c-5a+3b+6c=8a-5a+7b+3b-3c-6c
=3a+10b-9c
dan
6x-7(2y-1)(2y-2)=      6x-(14y+7)(2y-2)
=6x-28y^2+28y+14y-14
=6x-28y^2+42y-14