Jawabanmu

2014-09-09T22:23:07+07:00
15i + 14b - 30i-45j+51k = -15i + 14b - 45j + 51k
2014-09-09T22:23:23+07:00
= 15i + 14b -30i - 45j + 51k
= 14b + 15i - 30i -45j + 51k
= 14b - 15i -45j + 51k
15i + 14b - 30i -45j + 51k
15i + 14b - 30i -45j + 51k =15i - 30i + 14b -45j +51k =(-15i)+14b-45j+51k
makasih