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If A= '[[1,2,3],[3,-2,1], [4, 2, 1]], th...

If `A= '[[1,2,3],[3,-2,1], [4, 2, 1]]`, then find `A^2-23A-40 I` where I is Identify Matrix.

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The correct Answer is:
`[{:(-44,-42,-61),(-68,18,-15),(-78,-40,-48):}]`
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