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Compute the adjoint of the matrix A gi...

Compute the adjoint of the matrix `A` given by ,`A=[[1,-2,-2],[​2,1,−2],[​2,−2,1]]​`​ and verify that `A(adjA)=|A|I=(adj A)Adot`

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Given,`A=[[1,-2,-2],[​2,1,−2],[​2,−2,1]]​`​
`|A|=[[1,-2,-2],[​2,1,−2],[​2,−2,1]]​`​=27
Now,Adjoint of a matrix is the transpose of its' cofactor matrix.
`adj(A)=[[​−3,−6,6​],[-6,3,−6],[​-6,−63]]​`
`A.adj(A)=[[1,-2,-2],[​2,1,−2],[​2,−2,1]]​xx[[​−3,−6,6​],[-6,3,−6],[​-6,−6,3]]​`
=`[[​27,0,0],[​0,27,0],[​0,0,27]]​`
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