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If A^2=[[-1, 0, 2], [0, 0, 1], [-1, 1, 1...

If `A^2=[[-1, 0, 2], [0, 0, 1], [-1, 1, 1]]` , show that `A^2=A^(-1)` .

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`|A| = – 1(0 – 1) – 2(0) + 0 = 1 – 0 + 0`
`A^2=[[-1, 0, 2], [0, 0, 1], [-1, 1, 1]]`
`adj A=[[-1, 0, 2], [0, 0, 1], [-1, 1, 1]]`
`A^(-1)=[[-1, 0, 2], [0, 0, 1], [-1, 1, 1]]=A^2`
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