For the matrix, list the eigenvalues, repeated according to their

For the matrix, list the eigenvalues, repeated according to their multiplicites.
$\begin{bmatrix}6&0&0&0\\9&-8&0&0\\0&1&2&0\\6&8&-6&2\end{bmatrix}$

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Maked1954
Given matrix is $\begin{bmatrix}6&0&0&0\\9&-8&0&0\\0&1&2&0\\6&8&-6&2\end{bmatrix}$
which is triangular matrix:
The principd diagonal elements are eigen values
$$\displaystyle\Rightarrow{6},-{8},{2},{2}$$ are eigen values
with 2 is multiply 2 elements