Answers

The Brainliest Answer!
2016-03-01T23:36:57+05:30
A+B=8i +j -k
A-B= -2i +7j -9k
let A+B = C
and A - B = D
then cosine of angle between 2 vectors is given by
cos(theta)=A·B/|A||B|
A·B= 0
hence cos(theta)=0
theta = 90°
2 5 2