Question

04-Dadas as matrizes A e B abaixo:

Alguém pode me ajudar?​

Answer 1

$\large\boxed{\boxed{\begin{array}{l}\sf Dada\,as\,matrizes~A=\begin{bmatrix}\rm1&\rm3\\\rm2&\rm4\end{bmatrix}~e~B=\begin{bmatrix}\rm\!\!-1&\rm2\\\rm\,3&\rm1\end{bmatrix}\\\sf Calcule\,o\,produto\,A\cdot B\\\underline{\sf soluc_{\!\!,}\tilde ao\!:}\\\rm A\cdot B=\begin{bmatrix}\rm2\cdot(-1)+3\cdot3&\rm1\cdot2+3\cdot1\\\rm2\cdot(-1)+4\cdot3&\rm2\cdot2+4\cdot1\end{bmatrix}\\\\\rm A\cdot B=\begin{bmatrix}\rm-2+9&\rm2+3\\\rm-2+12&\rm4+4\end{bmatrix}\end{array}}}$

$\Huge\boxed{\boxed{\begin{array}{l}\rm A\cdot B=\begin{bmatrix}\rm7&\rm5\\\rm10&\rm8\end{bmatrix}\end{array}}}$