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If adj A = [[-1,2,2],[1,1,2],[2,2,1]], f...

If adj A = `[[-1,2,2],[1,1,2],[2,2,1]]`, find `A^(-1)`.

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Knowledge Check

  • If adj A=[[2,1],[3,-1]] , adj B=[[2,3],[-1,2]] then adj (AB) is :

    A
    `[[-3,-8],[-7,-3]]`
    B
    `[[-13,1],[-4,3]]`
    C
    `[[13,-1],[4,-3]]`
    D
    `[[3,8],[7,7]]`

  • If adj A=[[2,3],[4,1]] and adj B=[[1,-2],[-3,1]] then adj (AB) is :

    A
    `[[-7,-1],[7,-9]]`
    B
    `[[-6,1],[-2,-8]]`
    C
    `[[-7,7],[-1,-9]]`
    D
    `[[-6,-2],[5,-10]]`

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    If A=[[1,1,2],[1,2,2],[2,2,1]] verify that A(adj A) = (adj A)A = |A|I_(3) .

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