\[
\begin{bmatrix*}[r]
a&-b\\
-c&d
\end{bmatrix*},\quad
\begin{pmatrix*}[l]
a&-b\\
-c&d
\end{pmatrix*},\quad
\begin{vmatrix*}[c]
a&-b\\
-c&d
\end{vmatrix*}
\]