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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 show that `A^(3)-23A=40 I=0`

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Given `A=[[1,2, 3],[ 3,-2 ,1],[ 4, 2, 1]]`
`A^2=[[1,2, 3],[ 3,-2 ,1],[ 4, 2, 1]].[[1,2, 3],[ 3,-2 ,1],[ 4, 2, 1]]`

`=>[[13,4,8],[1,12,8],[14,6,15]]`

`A^3=A^2.A`
`A^3=[[13,4,8],[1,12,8],[14,6,15]].[[1,2, 3],[ 3,-2 ,1],[ 4, 2, 1]]`

`=>[[63,46,69],[69,-6,23], [92,46,79]]`
`∴A ^ ...
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