Question

dados as matrizes A e B abaixo,calcula 2A-B

Answer 1

$2A=2.\begin{pmatrix}1&2\\2&3\end{pmatrix}=\begin{pmatrix} 2&4\\4&6\end{pmatrix}$

$B=\begin{pmatrix}-1&0\\2&-1\end{pmatrix}$

$2A-B=\begin{pmatrix}2-1&2-0\\4-2&6+1\end{pmatrix} \\ =\begin{pmatrix}1&2\\2&7\end{pmatrix}$