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If A=[{:(2,0,1),(2,1,3),(1,-1,0):}] find...

If `A=[{:(2,0,1),(2,1,3),(1,-1,0):}]` find `A^(2)-5A+4I` and find a matrix `X` such that `A^(2)-5A+4I+X=O`

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The correct Answer is:
`[{:(-1,-1,-3),(-1,-3,-10),(-5,4,2):}],[{:(1,1,3),(1,3,10),(-5,-4,-2):}]`
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