Verify that the matrix equation A^(2)-4A...

Verify that the matrix equation `A^(2)-4A+3I = 0 ` is satisfied by the matrix
`A={:[(2,-1),(-1,2)]," where " I={:[(1,0),(0,1)]and`
`0={:[(0,0),(0,0)].` Hence obtain `A^(-1).`

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