Jawabanmu

2014-08-25T19:51:22+07:00
Liat ada kata dari, berarti dikurangi. Kurangi yg koefisiennya sama.
(-8x+10y-9z) - (4x-11y-9z)
= -8x - 4x + 10y + 11y - 9z + 9z
= -12x + 21 y
= -3(4x - 7y)

Semoga membantu
oke thanks ah di jawab
dibalik om kalo dari!
2014-08-25T19:54:01+07:00
4x-11y-9z-(-8x+10y-9z)
=4x-11y-9z+8x-10y+9z
=4x+8x-11y-10y-9z+9z
=12x-21y