If \( A=\left[\begin{array}{rr}3 & -5 \\ -4 & 2\end{array}\right] \), show that \( A^{2}-5 A-14 ...

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If \( A=\left[\begin{array}{rr}3 & -5 \\ -4 & 2\end{array}\right] \), show that \( A^{2}-5 A-14 I=O \)
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