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