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Questions  >>  CBSE XII  >>  Math  >>  Model Papers
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If $ A = \begin{bmatrix} 1 & 2 & 2 \\[0.3em] 2 & 1 & 2 \\[0.3em] 2 & 2 & 1 \end{bmatrix}$ what is $ A^2-4A-5I=0$

$\begin{array}{1 1} 1 \\ 2 \\ 0 \\ 3 \end{array} $

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