Question

4) If (6,4) and (3 ,m) are two perpendicular vectors, then m =​

Answer 1

Explanation:

If two vectors are perpendicular to each other then their scalar(dot) product must be zero.

Therefore,

A

.

B

=0

(2

i

^

+2

j

^

​

+3

k

^

)⋅(3

i

^

+6

j

^

​

+n

k

^

)=0

6+12+3n=0

3n=−18

n=−6