hysics Wr.18 If \( A=\left[\begin{array}{cc}3 & 1 \\ -1 & 2\end{array}\right] \), show that \( A...

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hysics Wr.18
If \( A=\left[\begin{array}{cc}3 & 1 \\ -1 & 2\end{array}\right] \), show that \( A^{2}-5 A+7 I=O \). Hence find \( A^{-1} \).
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