Considere a matriz \(A = \left( \begin{array}{rr} 2 & 1 \\ 1 & 3 \end{array}\right)\). Calcule Det(A).
5
4
6
7
Seja \(A = \left( \begin{array}{rrr} 2 & 0 & 2 \\ 1 & 5 & 6\\ -1 & 3 & 4 \end{array}\right)\). Calcule Det(A).
20
30
10
56
Calcular o valor de \(x\), sabendo que \(A = \left| \begin{array}{rrr} 3x & -3 & -1 \\ 1 & 0 & 3\\ 4 & 2 & 2x-1 \end{array}\right|\) = 0.
\(x=-\frac{41}{12}\)
\(x=-41\)
\(x=-\frac{41}{13}\)
\(x=-\frac{42}{13}\)
