Respostas

2013-08-23T16:16:49-03:00
Diagonal principal:
2.x.1 = 2x
1.6.1 = 6
3.4.0 = 0

Diagonal secundária:
1.4.1 = 4
2.6.0 = 0
3.x.1 = 3x

Det = 2x  6 + 0 - (3x + 0 + 4)
Det = 2x + 6 - 3x - 4
Det = 5x + 2

5x + 2 = 0
5x = -2
x = -2/5