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If A = [(1,2,2),(2,1,2),(2,2,1)] then sh...

If `A = [(1,2,2),(2,1,2),(2,2,1)]` then show that `A^(2)-4A-5I = O`.

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A=[(1,2,2),(2,1,2),(2,2,1)]impliesA^(3)-4A^(2)-6A=