3 and 4 .Determinants and Matrices
normal

સમીકરણો સંહતિ $x + 2y -3z = 1, (k + 3) z = 3, (2k + 1)x + z = 0$ એ સુસંગત ન હોય તો $k$ મેળવો.

A

$-3$

B

$1/2$

C

$0$

D

$2$

Solution

For the equation to be inconsistent $D=0$

$\therefore D=\left|\begin{array}{ccc}{1} & {2} & {-3} \\ {0} & {0} & {k+3} \\ {2 k+1} & {0} & {1}\end{array}\right|=0$

$\Rightarrow \quad k=-3$

and ${D_1} = \left| {\begin{array}{*{20}{c}}
1&2&{ – 3}\\
3&0&0\\
0&0&1
\end{array}} \right| \ne 0$

So that system is inconsistent for $\mathrm{k}=-3$

Standard 12
Mathematics

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