Question

If the vectors a = (i - j + 2k), vectors b = (2i + 4j + k) and vectors c = λi  + j + μk are mutually orthogonal, then (λ, μ) =

(1) 2, -3)

(2) (-2, 3)

(3) (3, –2)

(4) (–3, 2)

Answer 1

(4) (–3, 2) 

Solving we get: λ = –3, μ = 2