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3 and 4 .Determinants and Matrices
medium
સમીકરણની સંહતિ $x + y - z = 0, \, 3x - y - z = 0, \,x - 3y + z = 0$ ના ઉકેલની સંખ્યા મેળવો.
A
$0$
B
$1$
C
$2$
D
અનંત
Solution
(d) For the system of given homogeneous equations
$\Delta = \left| {\,\begin{array}{*{20}{c}}1&{\,\,1}&{ – 1}\\3&{ – 1}&{ – 1}\\1&{ – 3}&{\,\,1}\end{array}\,} \right| = 1( – 1 – 3) – 1(3 + 1) – 1( – 9 + 1)$
$ = – 4 – 4 + 8 = 0$. There are infinite number of solutions.
Standard 12
Mathematics