3 and 4 .Determinants and Matrices
easy

यदि $x,$ if  $\left| {\,\begin{array}{*{20}{c}}{ - x}&1&0\\1&{ - x}&1\\0&1&{ - x}\end{array}\,} \right| = 0$ तो $x$  का मान होगा

A

$ \pm \sqrt 6 $

B

$ \pm \sqrt 2 $

C

$ \pm \sqrt 3 $

D

$\sqrt 2 ,\sqrt 3 $

Solution

दिया है, $\Delta  = \left| {\,\begin{array}{*{20}{c}}{ – x}&1&0\\1&{ – x}&1\\0&1&{ – x}\end{array}\,} \right|$

 $\Delta  =  – x({x^2} – 1) – 1( – x – 0) = 0 \Rightarrow x =  \pm \sqrt 2 $.

Standard 12
Mathematics

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