Question

if A= 3i+2j , B= i-2j+3k find the length of A+B?​

Answer 1

Answer:

A + B = 3i + 2j + i - 2j + 3k = 4i + 3k

Magnitude = sqrt(4^2 + 3^2) = 5

A - B = 3i + 2j - i + 2j - 3k = 2i + 4j - 3k

Magnitude = sqrt(2^2 + 4^2 + 3^2) = 5.4