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Math Help - Matrices question?

  1. #1
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    Joined
    Mar 2008
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    Matrices question?

    (a) Calculate the inverse of A, where

    |1 −2| = A
    |4 −2|

    (b) Find the value of k for which the matrix B is singular, where

    |1 5 −3| = B
    |3 −3 3|
    |2 13 k|

    *give ur workings and clear answer.
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  2. #2
    Newbie
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    Apr 2008
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    United Kingdom
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    Okay, you just need some facts to get yourself going on this one.

    If you have a matrix that we'll call A:

    a b
    c d

    then the INVERSE of it will be

    [ 1/ (determinant of A) ] * d -b
    -c a

    The inverse of a 2x2 matrix - mathcentre

    That link above has it all summarised quite nicely.

    A matrix is SINGULAR if its determinant is zero.

    *give ur workings and clear answer.
    Once again, I will leave that to you.
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