Question

If a vector 2iˆ+3jˆ+7kˆ is divided by -8, the resultant is−14iˆ−38jˆ+xkˆ  then the value of x is         ​

Answer 1

Answer:

For perpendicular vectors.

A

⋅

B

=0

(2

i

^

+3

j

^

+8

k

^

)⋅(4

i

^

−4

j

^

+α

k

^

)=0

8−12+8α=0

−4+8α=0

⇒α=

2

1