Question

1. (13a - 8b) + (12a + 9b)=....
2. (15i + 14j + 13k) + (-30i-45j + 51k)=....
3. (2y + 15z) - (4y - 8)=....

Answer 1

1.) = 13a+12a-8b+9b = 25a +b
2.) = 15i-30i +14j-45j +13k+51k = -15i-31j+64k
3.) = 2y+15z-4y+8 = 2y-4y +15z+8 = -2y + 15z +8