Question

The value of unknown constant P is the two vectors ā=3i - 4j+2k and b = 2i - 3j +PK are mutually
perpendicular, is
(A)9
(B)-9
(C) 12
(D) -12​

Answer 1

Answer:

(B) - 9

Explanation:

For two vectors to be perpendicular, it's scalar product should be equal to zero,

So,

A.b =0

(3i-4j+2k).(2i-3j+pk)=0

6+12+2p=0

18+2p=0

2p=-18

P = - 9

The value of P should be equal to - 9

(B) - 9