Question

Dada a matriz: Imagem abaixo

Answer 1

$B=\left[\begin{array}{cccc}a_{11}&a_{12}&a_{13}&a_{14}\\a_{21}&a_{22}&a_{23}&a_{24}\end{array}\right]\\\\\\ B=\left[\begin{array}{cccc}-2&3&0&-1\\5&-7&1&0\end{array}\right]\\\\\\ a_{11}=-2\\ a_{21}=5\\ a_{13}=0\\ a_{22}=-7\\\\\\ a_{11}+a_{21}-a_{13}+2a_{22}\\\\ -2+5-0+2.(-7)\\\\ 3-14\\\\ \fbox{-11}$