Question

O valor do determinante

3 2 1
1 3 2
0 1 0


a) 0
b) -5
c)5
d) -7
e) 7

Answer 1

3 2 1 3 2
1 3 2 1 3
0 1 0 0 1
diagonal primaria
3x3x0=0
2x2x0=0
1x1x1=1
diagonal secundaria
0x3x1=0
1x2x3=6
0x2x1=0
soma agora
1-(6)=-5