Question

Dadas as matrizes A =
− 3 4
2 1
, B =

2 5
0 -1
e C =

6 1
3 0
, calcule o valor de:
Det A + Det B – 3Det C

Answer 1

det A = 2x4 + 1x3 = 8 + 3 = 11
det B = 0x5 + 2x1 = 2
det C = 3x1 - 0x6 = 3

det A - det B -3•det C = 11 - 2 - 3•3 = 9 - 9 = 0.