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    Evaluate
    | 1 2 1 |
    | 3 5 -2 |
    | -2 6 2|
    By forming an equivalent determinant with 1 0 0 in first row

    Help answer this question and explain how please. (The straight brackets are supposed to show a 3x3 determinant)
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    (Original post by Caikenlol)
    Evaluate
    | 1 2 1 |
    | 3 5 -2 |
    | -2 6 2|
    By forming an equivalent determinant with 1 0 0 in first row
    Surely it's just using elementary row operations. Have you tried this?
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    (Original post by B_9710)
    Surely it's just using elementary row operations. Have you tried this?
    It isn't for my friend, he has been trying for hours
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    (Original post by B_9710)
    Surely it's just using elementary row operations. Have you tried this?
    If your goal is to end up with the first row as (1 0 0), surely it will be much easier to use elementary column operations...

    @Gingerbread101 : this thread should be moved to f38
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    (Original post by DFranklin)
    If your goal is to end up with the first row as (1 0 0), surely it will be much easier to use elementary column operations...

    @Gingerbread101 : this thread should be moved to f38
    Moved :yy:
 
 
 
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