3 and 4 .Determinants and Matrices
easy

સમીકરણ સંહતિ ${x_2} - {x_3} = 1,\,\, - {x_1} + 2{x_3} = - 2,$ ${x_1} - 2{x_2} = 3$ ના ઉકેલની સંખ્યા મેળવો.

A

$0$

B

$1$

C

$2$

D

અનંત

Solution

(a) $D = \left| {\,\begin{array}{*{20}{c}}0&1&{ – 1}\\{ – 1\,\,\,}&0&{\,\,\,2}\\1&{ – 2\,\,\,}&{\,\,\,0}\end{array}\,} \right|\, = \,0$
$D = \left| {\,\begin{array}{*{20}{c}}
1&1&{ – 1}\\
{ – 2\,\,\,}&0&{\,\,\,2}\\
3&{ – 2\,\,\,}&{\,\,\,0}
\end{array}\,} \right|\, = \,14 \Rightarrow {D_1} \ne 0$
$D = 0$ and ${D_1} \ne 0$,hence the system is inconsistent, so it has no solution.

Standard 12
Mathematics

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