Show that \(A^{2} - 3I = 2A\) where \(A=\left[\begin{array}{ll}1 & 2 \\ 2 & 1\end{array}\...
Show that \(A^{2} - 3I = 2A\) where \(A=\left[\begin{array}{ll}1 & 2 \\ 2 & 1\end{array}\...
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