Question

calcule o determinante:

a) 1 3 2
2 5 4 =
1 2 2


b) 1 1 3
0 2 1 =
1 1 2

Answer 1

a) M=132
254= 13
122 25
12
(1.5.2+3.4.1+2.2.2)-(1.4.1+3.2.2+5.1.2)
(10+8+12)-(4+12+10)
36-26
detA=4

b) 113 11
021 02
112 11
(1.2.2+1.1.1+3.0.1)-
(3.2.1+1.1.1+1.0.2)
(4+1+3)-(6+1+0)
det A=8 - 7= 1