Question

calcule a determinante de:
1 1 2
2 1 3
1 4 2

Answer 1

1.1.2.2=1.4=4
2.1.1.2=2.2=4
4.4=16

Answer 2

Aplique a Regra de Sarrus

det a = (1 . 1 . 2) + (1 . 3 . 1) + (2 . 2 . 4) - (1 . 2 .2) - (1 . 3 . 4) - (2 . 1 . 1)

det a = 2 + 3 + 16 - 4 - 12 - 2

det a = 21 - 18

det a = 3