Question

If a vector

i j k

ˆ

8

ˆ

3

ˆ

2  

is perpendicular to the vector

j i k

ˆ ˆ

4

ˆ

4  

. Then the value of



is​

Answer 1

Answer:

A=2i+3j+8k

B=4i−4j+ak

Since A and B are perpendicularA.B=0

(2i+3j+8k)(4i−4j+ak)

8−12+8a=0

a=84=21