Chapter 6.4, Problem 15E

For Exercises 5–20, let

$\begin{array}{cc}A=\left[\begin{array}{rr}\hfill 1& \hfill 2\\ \hfill 4& \hfill 3\end{array}\right],& B=\left[\begin{array}{rr}\hfill -3& \hfill 5\\ \hfill 2& \hfill -1\end{array}\right],\\ C=\left[\begin{array}{rr}\hfill 1& \hfill -1\\ \hfill -1& \hfill 1\end{array}\right],& D=\left[\begin{array}{rr}\hfill 1& \hfill 1\\ \hfill 1& \hfill 1\end{array}\right],\\ E=\left[\begin{array}{rr}\hfill 1& \hfill 3\\ \hfill 2& \hfill 6\end{array}\right],& F=\left[\begin{array}{rr}\hfill 3& \hfill 3\\ \hfill -1& \hfill -1\end{array}\right],\\ 0=\left[\begin{array}{rr}\hfill 0& \hfill 0\\ \hfill 0& \hfill 0\end{array}\right],& I=\left[\begin{array}{rr}\hfill 1& \hfill 0\\ \hfill 0& \hfill 1\end{array}\right].\end{array}$

Find each of the following.

15. BA