If and are perpendicular vectors such that and find the value of
Since a and b vectors are perpendicular .
⇒
Now,
||2 = ||2 + ||2 + 2||||cos
⇒132 = 52 + ||2 + 0 …( cos)
⇒||2 = 169 - 25 = 144
⇒|| = 12
Ans:|| = 12