Find λ, if
.
We need to solve the problem by finding cross product through determinant.
Let
, also
(Given)

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Inserting the given values we get,

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On comparing LHS and RHS we get,
42+14λ=0 and-2λ-6=0
14λ= -42and-2λ=6
λ= -3andλ=-3
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