Question

Prove that the three vectors 6i +2j+4k, i +5j-4k and 2î – 2j-2k are at right angles to one another

Answer 1

Answer:

let,

A=6i+2j+4k, B=i+5j-4k, C=2i-2j-2k

A.B=6+10-16

=0

therefore A and B are in right angle

B.C=2-10+8

=0

therefore B and C are in right angle

therefore we can say that A,B and C are at right angles to one another