Question
If $A =\left[\begin{array}{cc}3 & -2 \\ -1 & 4\end{array}\right], B =\left[\begin{array}{l}6 \\ 1\end{array}\right], C =\left[\begin{array}{r}-4 \\ 5\end{array}\right]$ and $D =\left[\begin{array}{l}2 \\ 2\end{array}\right]$, find $AB +2 C -4 D$.