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Math Help - How do you find the find the determinant of 3x3 matrix ?

  1. #1
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    How do you find the find the determinant of 3x3 matrix ?

    I was given this review problem but i dobnt remeber learning this :

    find u v x w (u dot v cross w).
    in other words find the determinant of 3x3 matrix:
    1 4 3
    2 5 6
    1 2 7


    How would you do this ?
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by nosh View Post
    I was given this review problem but i dobnt remeber learning this :

    find u • v x w (u dot v cross w).
    in other words find the determinant of 3x3 matrix:
    1 4 3
    2 5 6
    1 2 7


    How would you do this ?
    see here

    you may also want to see here
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  3. #3
    Moo
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    You may also be interested in the Rule of Sarrus : Rule of Sarrus - Wikipedia, the free encyclopedia
    Once you've understood the picture on the right, you've understood the method.
    And it's quite straightforward :P
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Moo View Post
    You may also be interested in the Rule of Sarrus : Rule of Sarrus - Wikipedia, the free encyclopedia
    Once you've understood the picture on the right, you've understood the method.
    And it's quite straightforward :P
    i wanted to post a link to that method as well. but i never remembered what it was called. couldn't bother searching for it
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