If vector a = 2i – j + 3k and vector b = (6i +λj +9k) and vector a || vector b, find the value of λ.
If vector a = 2i – j + 3k and vector b = (6i +λj +9k) and vector a || vector b, find the value of λ.
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vector a || vector b ⇒ vector a × vector b = vector 0
⇒ i(–9 – 3λ) + k(2λ + 6) = vector 0
⇒ λ = – 3.
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