Question

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

Answer 1

[2 3 1] 2 3
[4 -2 1] 4 -2
[2 1 1] 2 1

Det= [-4+6+4]-[-4+2+12]
Det= 6-10
Det= -4