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3 and 4 .Determinants and Matrices
easy
$x$ ની . . . કિમત માટે $\left| {\,\begin{array}{*{20}{c}}{ - x}&1&0\\1&{ - x}&1\\0&1&{ - x}\end{array}\,} \right| = 0$ મળે.
A
$ \pm \sqrt 6 $
B
$ \pm \sqrt 2 $
C
$ \pm \sqrt 3 $
D
$\sqrt 2 ,\sqrt 3 $
Solution
(b) We have $\Delta = \left| {\,\begin{array}{*{20}{c}}{ – x}&1&0\\1&{ – x}&1\\0&1&{ – x}\end{array}\,} \right|$
$\Delta = – x({x^2} – 1) – 1( – x – 0) = 0 \Rightarrow x = \pm \sqrt 2 $.
Standard 12
Mathematics