VectorHard
Question
The number of distinct real values of λ, for which the vectors - λ2 
and 
are coplanar, is
and are coplanar, isOptions
A.zero
B.one
C.two
D.three
Solution
= 0 ⇒ λ6 - 3λ2 - 2 = 0⇒ (1 + λ2)2 (λ2 - 2) = 0 ⇒ λ = ± √2.
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