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Math Help - [SOLVED] Sometimes I hate linear algebra...

  1. #1
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    [SOLVED] Sometimes I hate linear algebra...

    Ahh!

    This is too abstract.

    Find all values of a such that the matrix

    [ a 2 a]
    [ a a 3]
    [ a 4 a]

    has rank 1, and values of a for rank 2

    Please show me how you did it, i don't even know where to start
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  2. #2
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    Quote Originally Posted by Noxide View Post
    Ahh!

    This is too abstract.

    Find all values of a such that the matrix

    [ a 2 a]
    [ a a 3]
    [ a 4 a]

    has rank 1, and values of a for rank 2

    Please show me how you did it, i don't even know where to start

    Bring the matrix to echelion form (use Gauss or Gauss-Jordan) and check when 1 or two rows become zero.
    Be sure you distinguish the case a = 0 for the reduction.

    Tonio
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  3. #3
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    Tonio to the rescue, thanks again!
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