For what value of a are the vectors A = 2î + aĵ and B = 3î − 6ĵ perpendicular?
Correct answer C. 1
Explanation
Perpendicular vectors have A·B = 0. So (2)(3) + (a)(−6) = 0, giving 6 − 6a = 0 and a = 1.
Answer checked How we write and check questions
Discussion