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Math Help - Calculating the determinant of a couple of matrices

  1. #1
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    Calculating the determinant of a couple of matrices

    Hi everyone.
    Here I have two matrices that I would like help with, in calculating its' determinant!
    The first one gotta have a nice trick to it, I am sure that going the longer way is not the only way!

    First one:


    Second one:



    Thanks in advance!
    Morad
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  2. #2
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    Re: Calculating the determinant of a couple of matrices

    Well the second one is easy because there are rows and columns that are almost entirely composed of zeroes.
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  3. #3
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    Re: Calculating the determinant of a couple of matrices

    For the first one you can do R1 goes to R1+R2+R3+R4 or C1 goes to C1+C2+C3+C4 and you will find that all the elements of R1 OR C1 will become (a+b+c+d). take it common and proceed now you will have all 1s in one Row / column
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