What are the eigenvalues of this matrix?

What are the eigenvalues of this matrix?

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\[\begin{pmatrix}
3 &1 \\ -1
&3
\end{pmatrix}\]
and
\[\begin{pmatrix}
3 &1 \\0
&3
\end{pmatrix}\]

Cayley-Hamilton?\[|A - \lambda I |=0\]

Unless I'm missing something and those parentheses mean something else.

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