Let $$A = \left[\begin{array}{rrr} -6 & 1 & -6 \\ 5 & 9 & 1 \\ \end{array}\right], \quad B = \left[\begin{array}{rr} -5 & 4 \\ -2 & 2 \\ -2 & 4 \\ \end{array}\right].$$ Then $$C = AB = \left[\begin{array}{rrr} c_{11} & c_{12} \\ c_{21} & c_{22} \\ \end{array}\right],$$ and $$D = BA = \left[\begin{array}{rrr} d_{11} & d_{12} & d_{13} \\ d_{21} & d_{22} & d_{23} \\ d_{31} & d_{32} & d_{33} \\ \end{array}\right],$$ where
$c_{11}$ = ,
$c_{12}$ = ,
$c_{21}$ = ,
$c_{22}$ = ,
and
$d_{11}$ = ,
$d_{12}$ = ,
$d_{13}$ = ,
$d_{21}$ = ,
$d_{22}$ = ,
$d_{23}$ = ,
$d_{31}$ = ,
$d_{32}$ = ,
$d_{33}$ = .
The determinant of $D$ is .