Question

Calcule o determinante da matriz abaixo:

Answer 1

Siga a resolução da questão

$\left[\begin{array}{cc}\mathtt{ a_{11} }&\mathtt{ a_{12} }\\\mathtt{ a_{21} }&\mathtt{ a_{22} }\\\end{array}\right] \mathtt{ = a_{11} \times a_{22}- a_{12} \times a_{21} } \\ \\ \left[\begin{array}{cc}\mathtt{0}&\mathtt{7}\\\mathtt{3}&\mathtt{ - 8} \\\end{array}\right] \mathtt{ = 0 \times ( - 8) - 7 \times 3 = \boxed{\mathtt{ - 21}}}$

Resposta: -21

Att: José Armando

Answer 2

$\left[\begin{array}{c c}\sf0&\sf7\\\sf3&\sf-8\end{array}\right]$

$\sf det=0\cdot(-8)-7\cdot3$

$\sf det=0-21$

$\red{\sf det=-21}$