Question

if vector A = 3i - 2j -k and vector B = 2i + 4j + 2k find the direction of A + B with x - axis​

Answer 1

A = 3i - 2j - k

B = 2i + 4j + 2k

A + B = 5i + 2j + k

so, the direction with x axis is

cose = (A + B).i/|A + B|

cose = 5/root30

so the angle with x axis

e = cos-1(5/root30)