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The vector P=ai+aj+3k and Q=ai-2j-k are perpendicular to each other.the positive value of a is?

The vector P=ai+aj+3k and Q=ai-2j-k are perpendicular to each other.the positive value of a is?

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Grade:12th pass

1 Answers

Satyam Gupta
34 Points
5 years ago
Cos90=ai+aj+3k.ai-2j-k/underroot(2a^2+3)(a^2+4+1)a^2-2a-3=0After solving the eqn we get a=3 , -1Hence correct answer is 3

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