For the matrix A = [ 2 -1 1 -1 2 -1 1 -1 2] verify that A^3 - 6A^2 - Maths - Determinants

Question

For the matrix A = [ 2 -1 1 -1 2 -1 1 -1 2] verify that A^3 -
6A^2 + 9A - 4I = 0, Hence find A-1

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For the matrix A = [ 2 -1 1 -1 2 -1 1 -1 2] verify that A^3 - 6A^2 + 9A - 4I = 0, Hence find A-1

For the matrix A = [ 2 -1 1 -1 2 -1 1 -1 2] verify that A^3 - 6A^2 + 9A - 4I = 0, Hence find A^-1