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Vector addition

  1. Jul 14, 2012 #1
    1. The problem statement, all variables and given/known data
    Screenshot2012-07-14at25427AM.png
    2. Relevant equations
    3. The attempt at a solution
    Do you see how 1 1 1 changes to 3 3 3. i know why gaussian elimination you can change any vector by multiplying it by anything you want. but for some reason i have difficulty believing that you're allowed to do that here. is that what they're doing? just multiplying that vector by 3 so as to facilitate the arithmetic. Or maybe they're multiplying both vectors by 3, so as to get rid of the 1/3, but that doesn't explain how the 1/3 gets on the left side of the parentheses.
     
  2. jcsd
  3. Jul 14, 2012 #2
    There is nothing wrong with

    (1 1 1) = ([itex]\frac{3}{3}[/itex] [itex]\frac{3}{3}[/itex] [itex]\frac{3}{3}) = [/itex][itex]\frac{1}{3}[/itex](3 3 3)
     
  4. Jul 14, 2012 #3
    ok, thanks
     
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