If the vectors P = ai + aj + 3k and Q = ai - 2j - k are mutually perpendicular, then the positive value of 'a' is .............. .
(A) 3
(B) 4
(C) 9
(D) 13
Answers
Answered by
39
Explanation:
3 is the correct answer
Attachments:
Answered by
10
Answer:
(A) 3
Explanation:
Since P is perpendicular to Q, The product of P & Q will be Zero.
=> P.Q = 0 = a²–2a–3
=> a–3= 0
Therefore, a=3 ✓
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