Let \( A = \begin{pmatrix} 2 & -1 & 0\\ 0 & 3 & 0\\ -1 & 0 & 1 \\\end{pmatrix}\)
and \(B = A^3 + A^2 + I_3 \) , where \( I_3 \) is the identity matrix of order 3.
Then Sum of The Greatest and Lowest eigenvalue?
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