(15i + 14b + 13k) + (-30i – 45j + 51k) =…

15i-30i+14b+13k+51k-45j
-15i+14b+18k-45j

hasilnya : 
-15i+14b+18k-45j

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