> 
> Find the eigenvalues of the matrix below:
> 
> 
> $\begin{pmatrix} 0 & 0 & 2\\ 0 & 0 & 0\\ 2 & 0 & 0\end{pmatrix}$
> 
> 
> 

As usual, I try to solve the equation below:
$\begin{vmatrix} - \lambda &0&2\\0&0&0\\2&0&-\lambda\end{vmatrix} = 0 $

But in this case the equation above give $ 0 = 0 $, and I got stuck.

What should I do?