Question

Dadas as matrizes abaixo, resolva as operações:​

Answer 1

$\texttt{Olhar para baixo}$

${ A = \begin{array}{|cc|}5&4 \\ - 2& 3\end{array}} \\ \\ \det(A) = (5)(3) - ( - 2)(4) \\ \\ \det(A) = 15 + 8 \\ \\ \boxed{\det(A) = 23}\checkmark$

${B = \begin{array}{|ccc|}1&2&0 \\ 0& -3&5\\ -1&3&-2\end{array}} \\ \\B = \begin{array}{|ccc|}1&2&0 \\ 0& -3&5\\ -1&3&-2\\ 1&2&0\\ 0&-3&5\end{array}\\\\ \det(B) = ( 6+0 - 10)-(0 + 15 + 0) \\ \\ \det(B) = -4-15 \\ \\ \boxed{\det(B) = - 19}\checkmark$