1.

IfA= {:[( 2,-1,1),(-1,2,-1),(1,-1,2) ]:} Verify thatA^(3) -6A^(2) +9A -4I=Oand hence find A^(-1)

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ANSWER :`(1)/(4){:[( 3,1,-1),(1,3,1),(-1,1,3)]:}`


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