Compute A−BA - BA−B where A=(4723)A = \begin{pmatrix} 4 & 7 \\ 2 & 3 \end{pmatrix}A=(4273) and B=(1251)B = \begin{pmatrix} 1 & 2 \\ 5 & 1 \end{pmatrix}B=(1521).
(35−32)\begin{pmatrix} 3 & 5 \\ -3 & 2 \end{pmatrix}(3−352)
(3532)\begin{pmatrix} 3 & 5 \\ 3 & 2 \end{pmatrix}(3352)
(5974)\begin{pmatrix} 5 & 9 \\ 7 & 4 \end{pmatrix}(5794)
(−3−53−2)\begin{pmatrix} -3 & -5 \\ 3 & -2 \end{pmatrix}(−33−5−2)