Q5 of 51 Page 26

Find the value of λ so that the following vectors are coplanar.

Formula : -





Given: -



we know that vector are coplanar if their scalar triple product is zero



we have



now, using



⇒ 0 = 1(λ – 1) + 1(2λ + λ) + 1( – 2 – λ)


⇒ 0 = λ – 1 + 3 λ – 2 – λ


⇒ 0 = 3 λ – 3


⇒ λ = 1


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