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[tex]\Large\boxed{\begin{array}{l}\rm A=\begin{bmatrix}\sf1&\sf3\\\sf0&\sf-2\end{bmatrix}~~B=\begin{bmatrix}\sf4&\sf-1\\\sf1&\sf2\end{bmatrix}\\\sf A\cdot B=\begin{bmatrix}\sf1\cdot4+3\cdot1&\sf1\cdot(-1)+3\cdot2\\\sf0\cdot4-2\cdot1&\sf0\cdot(-1)-2\cdot2\end{bmatrix}\\\sf A\cdot B=\begin{bmatrix}\sf7&\sf5\\\sf-2&\sf-4\end{bmatrix}\end{array}}[/tex]
