This is LaTeX code:
[latex]
\left[ \begin{array}{cccc} 1 & 2 & 0 & 0 \\ 2 & 1 & 1 & -1 \\ 0 & 3 & -1 & -1 \\ 3 & 0 & 2 & -1 \end{array} \right]
[/latex]