Question

Calcule o determinante da matriz

A=(1 2)
(-5 -3)

Answer 1

$\large\boxed{\begin{array}{l}\rm A=\begin{pmatrix}\rm\,\,1&\rm\,2\\\rm\!\!-5&\rm\!\!-3\end{pmatrix}\\\rm det\,A=1\cdot(-3)-2\cdot(-5)\\\rm det\,A=-3+10\\\rm det\,A=7\end{array}}$