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Show that the matrix A=[[1,2,2],[2,1,2],...

Show that the matrix `A=[[1,2,2],[2,1,2],[2,2,1]]` satisfies the equation `A^2-4A-5I_3=O` and hence find `A^(-1)`

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Show that A = [[1,2,2],[2,1,2],[2,2,1]] satrisfies the matrix equation A^2-4A-5I_3 =0

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