If \( A=\left[\begin{array}{ll}1 & 3 \\ 3 & 4\end{array}\right] \) and \( A^{2}-k A-5 I_{2}=O \)...

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If \( A=\left[\begin{array}{ll}1 & 3 \\ 3 & 4\end{array}\right] \) and \( A^{2}-k A-5 I_{2}=O \), then the value of \( k \) is
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