If A→=i^+j^+k^,B→=4i^+3j^+4k^ and C→=i^+αj^+βk^ are linearly dependent vector and |C→|=3, then
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a
α=1,β=−1
b
α=1,β=±1
c
α=−1,β=±1
d
α=±1,β=1
answer is D.
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Detailed Solution
Vector A→=i^+j^+k^,B→=4i^+3j^+4k^, And C→=i^+αj^+βk^ are linearly independent, if 1114341αβ=0 Operate C3→C3−C1;C2→C2−C1 we get, 1004−101α−1β−1=0⇒−(β−1)=0⇒β=1 Again, |C→|=1+α2+β2=3⇒1+α2+β2=3⇒1+α2+1=3∴α2=1⇒α=±1Hence α=±1,β=1