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= 13a - 8b + 21a + 9b
= 34a + b
b. (15i -14j + 13k) + ( -30i - 45j + 51k)
= 15i - 14j + 13k - 30i - 45j + 51k
= -15i -59j +64k
c. (3x - 17y + 35z) + (4x + 23y - 9z)
= 3x - 17y + 35z + 4x + 23y - 9z
= 7x + 6y + 26z