Respostas

2014-02-22T20:24:08-03:00
\begin{bmatrix}
 x_{11}  &  x_{12} \\ 
  x_{21} &  x_{22} 
\end{bmatrix}\\\\
 x_{11} = 1 + 2*1 = 3\\
 x_{12} = 1 + 2*2 = 5\\
 x_{21} = 2 + 2*1 = 4\\
 x_{22} = 2 + 2*2 = 6\\
\boxed{\begin{bmatrix}
3 &5 \\ 
 4& 6
\end{bmatrix}}
D = -5*4 + 3*6
D = -20 + 18
D = -2