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If A=[(1,2,3),(3,-2,1),(4,2,1)] then ...

If `A=[(1,2,3),(3,-2,1),(4,2,1)]` then show that `A^3-23A -40 I=0`.

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SUNSTAR PUBLICATION-SUPPLEMENTARY EXAM QUESTION PAPER JULY -2014-PART-C
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  13. If A=[(1,2,3),(3,-2,1),(4,2,1)] then show that A^3-23A -40 I=0.

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