Question

O Valor do determinante da matriz A= 2 -2 1
3 -1 -2
-1 3 -1
A)23
B)11
C)34
D)21
E)12

Answer 1

$\left[\begin{array}{ccc}2&-2&1\\3&-1&-2\\-1&3&-1\end{array}\right]$

2 - 4 + 9 - (1 - 12 + 6) → 7 - (-5) → 7 + 5 => 12