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Question
Find the inverse of the matrix `A = [(1,2,-2),(-1,3,0),(0,-2,1)]`using elementary row transformations.
Solution
`A = [(1,2,-2),(-1,3,0),(0,-2,1)]`
= 1[3] - 2[-1] - 2[2]
`= 3 + 2 - 4 = 1 != 0 => A^(-1)` exist
we know
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