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Cal III/ Multi-V (vector notation troubles)

  1. Sep 12, 2010 #1
    1. The problem statement, all variables and given/known data
    Given vector A = i + j - k and vector B= i - j + k, calculate ||3A-B||.

    My work can be found here (I am not literate in Latex markups):
    http://img714.imageshack.us/img714/732/sixhomeworkproblems001.jpg [Broken]

    I am unfamiliar with the notation of the double bars surrounding this vector combination. I think, and I say that very loosely, that it means to find the normal vector to the plane. If I could get some clarification for that, then I don't think the problem should be too difficult.

    2. Relevant equations
    Uncertain of problem notation.

    3. The attempt at a solution
    http://img823.imageshack.us/img823/8554/attempt001.jpg [Broken]
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Sep 12, 2010 #2
    You're really close. All you have to do is find the magnitude of that vector. The equation for that is the square root of the sum of all of its components squared.
  4. Sep 12, 2010 #3
    Wow. So all the question asks for is the magnitude?

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