Temtukan penjumlahan aljabar berikut. A. (13a-8b) +(21a+9b)=.... B. (15i-14j+13k)+(-30i-45j+51k)=.... C. (3x-17y+35z)+(4x+23y-9z)=....

a. (13a - 8b) + (21a + 9b)
= 13a + 21a - 8b + 9b
= 34a + b

b. (15i - 14j + 13k) + (-30i - 45j + 51k)
= 15i - 30i - 14j - 45j + 13k + 51k
= -15i - 59j + 64k

c. (3x - 17y + 35z) + (4x + 23y - 9z)
= 3x + 4x - 17y + 23y + 35z - 9z
= 7x + 6y + 27z