Question

Dadas as matrizes A=
|5 -2 3|
|0 1 -1|
E a matriz B=
|7 1|
|3 -3|
|1 0| então AxB é igual a:

Answer 1

$A=\begin{vmatrix}5&-2&3\\0&1&-1\end{vmatrix}$

$B=\begin{vmatrix}7&1\\3&-3\\1&0\end{vmatrix}$

$\begin{vmatrix}5&-2&3\\0&1&-1\end{vmatrix}\cdot\begin{vmatrix}7&1\\3&-3\\1&0\end{vmatrix}\Rightarrow\begin{vmatrix}5\cdot7+(-2)\cdot3+3\cdot1&5\cdot1+(-2)\cdot(-3)+3\cdot0\\0\cdot7+1\cdot3+(-1)\cdot1&0\cdot1+1\cdot(-3)+(-1)\cdot0\end{vmatrix}$

$\begin{vmatrix}32&11\\2&-3\end{vmatrix}$