Question

Dada a matriz A abaixo,calcule o determinante da matriz 3.a​

Answer 1

$\sf A=\left[\begin{array}{c c c}\sf2&\sf1&\sf3\\\sf1&\sf1&\sf1\\\sf0&\sf1&\sf4\end{array}\right]\left|\begin{array}{c c}\sf2&\sf1\\\sf1&\sf1\\\sf0&\sf1\end{array}\right|$

$\sf det\,A=(8+0+3)-(4+2+0)$

$\sf det\,A=(8+3)-(4+2)$

$\sf det\,A=11-6$

$\red{\sf det\,A=5}$