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    cwaller's Avatar
    cwaller Posts: 19, Reputation: 1
    New Member
     
    #1

    Dec 17, 2010, 07:12 PM
    Find the inverse(a-1) of the following equation
    A=[2-5]
    [2 6] I inverted to [6 5]
    [-2 2] Don't know what to do next to solve.
    jcaron2's Avatar
    jcaron2 Posts: 986, Reputation: 204
    Senior Member
     
    #2

    Dec 17, 2010, 08:22 PM
    The inverse of a square matrix is the adjoint divided by the determinant. So far you've successfully found the adjoint matrix. Now, to finish doing the inverse, you just need to divide everything by the determinant of A, and you're done. Your 6 should be 6/22, your 5 should be 5/22, etc.

    When you're all done, you can check your work by doing the matrix multiplication A * inv(A) and the result should be the identity matrix [1 0][0 1].

    Good job so far.



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