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[tex]A.B\,= \left[\begin{array}{ccc}-5&3\\-2&1\end{array}\right] \left[\begin{array}{ccc}1&-1\\1&-3\end{array}\right]\,= \left[\begin{array}{ccc}-2&-4\\-1&-1\end{array}\right] [/tex]

[tex]invers\, A.B\,= -\frac{1}{2} \left[\begin{array}{ccc}-1&4\\1&-2\end{array}\right]\,= \left[\begin{array}{ccc}1/2&-2\\-1/2&1\end{array}\right] [/tex]