1.

Solve the following equations by matrix method. If A = [(2,-1,1),(-1,2,-1),(1,-1,2)] verify that A^(3) - 6A^(2) + 9A = 4 I = 0 and hence, find A^(-1).

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


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