3 and 4 .Determinants and Matrices
medium

જો સમીકરણની સંહતિ $x - ky - z = 0$, $kx - y - z = 0$ અને $x + y - z = 0$ ને શૂન્યતર ઉકેલ હોય, તો $k$ ની કિમત મેળવો.

A

$-1, 2$

B

$1, 2$

C

$0, 1$

D

$-1, 1$

(IIT-2000)

Solution

(d) For non-trivial solution $\Delta = 0$
==> $\left| {\,\begin{array}{*{20}{c}}1&{ – k}&{ – 1}\\k&{ – 1}&{ – 1}\\1&1&{ – 1}\end{array}\,} \right|\, = \,0$ ==> $k = 1,\, – 1.$

Standard 12
Mathematics

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