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If A = ((1,0,2),(0,2,1),(2,0,3)), prove that A^3 - 6A^2 + 7A + 2I = 0.

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If A = ((1,0,2),(0,2,1),(2,0,3)), prove that A3 - 6A2 + 7A + 2I = 0.

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Here A2 = AA

LHS : A3 - 6A2 + 7A + 2I

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