List of top Mathematics Questions on Matrix asked in TS EAMCET

If \(a\) is a real root of the equation \[ x^{3}-2x^{2}-2x-3=0 \] and \[ A= \begin{bmatrix} 1& 2& a\\ 2& a& 1\\ a& 1& 2 \end{bmatrix}, \] then \(A^{2}-A=\)