Question

Aplicando a regra de sarrus calcule os determinantes[ -2 1 3 ] [4 -3 1 ] [2 4 1]

Answer 1

$\left|\begin{array}{ccc}-2&1&3\\4&-3&1\\2&4&1\end{array}\right| =\\ \\ =(-2)(-3).1+1.1.2+3.4.4-[3.(-3).2)+1.4.1+(-2).4.1]=\\ \\ =6+2+48-(-18+4-8)=56-(-22)=78$