How to find the eigenvalues and eigenvector without computation? The given matrix is 
$$
\begin{pmatrix}
2 & 2 & 2 \\
2 & 2 & 2 \\
2 & 2 & 2 \\
\end{pmatrix}
$$
so, how could i find the eigenvalues and eigenvector without computation?
Thank you

If sum of all the elements in each rows or each columns are same then sum of elements in one row is nothing but one of the eigenvalue of that matrix.
    In above matrix sum of all the elements in each rows is 6.Hence 6 is the eigenvalue of that matrix.   
