Question

2 5 6
1 6 7
-1 2 3
calcular o determinante :

Answer 1

Resolvendo pela regra de Sarrus:

$\left[\begin{array}{ccc}2&5&6\\1&6&7\\-1&2&3\end{array}\right] \left[\begin{array}{ccc}2&5\\1&6\\-1&2\end{array}\right]$

$Det = \\ \\ 2*6*3+5*7*-1+6*1*2- (-1*6*6-2*7*2-3*1*5) = 6$