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Q.

The values of λ such that

(x,y,z)(0,0,0) and (++3 )x+(3-3+ )y+(-4+5 )z=λ(xi̅+yj̅+zk̅) are

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a

0, 1

b

0, -1

c

1, -1

d

0, 1, -1

answer is B.

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Detailed Solution

(x+3.y-4z)i+(x-3y+5z)j+(3x+y)k                               =λxi+λyi+λzk x+3y-4z=λx  x(1-λ)+3y-4z=0 z-3y+5z=λy  x-(3+λ)y+5z=0 3x+y=λz          3x+y-λz=0 1-λ3-41-(3+λ)531-λ=0  (1-λ) (λ2+3λ-5)-3(-λ-15)-4(1+9+3λ)=0 λ2+3λ-5-λ3-3λ2+5λ+3λ+45-40-12λ=0 -λ3-2λ2-λ=0  λ(λ2+2λ+1)=0                                 λ=0, -1

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