Question

If a vector (2ì+3j+8k) is perpendicular to the
vector (4j-4i+ak), then the value of a is:
(A)-1
(B) 1/2
(C)-1/2
(D) 1​

Answer 1

Answer:

B

Explanation:

A=(2i+3j+8k)

B=(4i-4j+ak)

value of a=?

A.B=0

(2i+3j+8k)(4i-4j+ak)=0

8i-12j+8k=0

8-12+8a=0

-4+8a=0

8a=4

a=4/8

a=1/2