Question

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

Answer 1

Answer:

(b) - 9

Explanation:

If two vectors are perpendicular, then

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

6+12+2p=0

18+2p=0

2p= - 18

P = - 9