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If A={:[(1,2,2),(2,1,2),(2,2,1)], prove ...

If `A={:[(1,2,2),(2,1,2),(2,2,1)]`, prove thst `A^2-4A-5I = O ` and hence, obtain `A^-1`.

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The correct Answer is:
`(1)/(5)[{:(-3,2,2),(2,-3,2),(2,2,-3):}]`
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