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Math Help - Matrix

  1. #1
    Junior Member
    Joined
    Jan 2007
    Posts
    40

    Matrix

    Can someone give me a hand with this one?

    Find the determinate of the matrix
    {8+4a 4}
    {5+3a 3}

    Possible solutions:
    4
    44
    4+24a
    44+24a
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  2. #2
    Senior Member
    Joined
    Apr 2006
    Posts
    401
    Quote Originally Posted by gretchen View Post
    Can someone give me a hand with this one?

    Find the determinate of the matrix
    {8+4a 4}
    {5+3a 3}

    Possible solutions:
    4
    44
    4+24a
    44+24a
    The determinant of a 2x2 matrix is defined to be ad - bc;

    ((8 + 4a)*(3)) - ((4)(5 + 3a))

    (12*a + 24) - (12a + 20)

    = 4
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