Tolong Carikan kak,pliase​

Jawab:

A = 2i + j – 4k

B = 3i + 5j + k

a) A + B

A + B = (2i + j – 4k) + (3i + 5j + k)

A + B = (2 + 3)i + (1 + 5)j + (-4 + 1)k

A + B = 5i + 6j – 3k

b) A – B

A – B = (2i + j – 4k) + (3i + 5j + k)

A – B = (2 – 3)i + (1 – 5)j + (-4 – 1)k

A – B = -i – 4j – 5k