tentukan hasil penjumlahan bentuk 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 + 26z

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 + 26z