Answer
$-407$
Work Step by Step
$\left|\begin{array}{ll}
3 & 1\\
-2 & 3
\end{array}\right|=3(3)-1(-2)=11$
$\left|\begin{array}{ll}
7 & 0\\
1 & 5
\end{array}\right|=35-0=35$
$\left|\begin{array}{ll}
3 & 0\\
0 & 7
\end{array}\right|=21-0=21$
$\left|\begin{array}{ll}
9 & -6\\
3 & 5
\end{array}\right|=45+18=63$
$\left|\begin{array}{ll}
11 & 35\\
21 & 63
\end{array}\right|=693-735=-407$
