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Question
If the vectors 4^i−7^j−2^k,^i+5^j−3^k,3^i−λ^j+^k form a triangle then λ=
If the vectors 4^i−7^j−2^k,^i+5^j−3^k,3^i−λ^j+^k form a triangle then λ=
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Solution
The correct option is A 12
Triangle follow Addition Law
^i+5^j−3^k+3^i−λ^j+^k=4^i−7^j−2^k
(5−λ)=−7
λ=12
Triangle follow Addition Law
^i+5^j−3^k+3^i−λ^j+^k=4^i−7^j−2^k
(5−λ)=−7
λ=12
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