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Q.

Let the system of linear equations   4x+λy+2z=0, 2x-y+z=0μx+2y+3z=0,λ,μ∈R has a non-trivial solution .Then which of the following is true?

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a

λ=2,μ∈R

b

μ=-6,λ∈R

c

λ=3,μ∈R

d

μ=6,λ∈R

answer is D.

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Detailed Solution

If the homogeneous system of equations has non trivial solutions then the determininat  of the coefficient matrix must be zero⇒4λ22−11μ23=0Expand the determinant as 4(-3-2)-λ(6-μ)+2(4+μ)=0⇒-20-6λ+μλ+8+2μ=0 ⇒-6λ+2μ+μλ-12=0 ⇒μ−6λ+2=0⇒μ=6 or λ=−2⇒μ=6 & λ∈R
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