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Homework Help: 3D unit vector question

  1. Mar 7, 2010 #1
    I was given the question,

    If u=ai+2j+4k and v=3i+bj+k, calculate a and b
    in a textbook from school (revision for a test).

    Any thoughts?
  2. jcsd
  3. Mar 7, 2010 #2


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    Homework Helper

    (Moderator's note: thread moved from "General Math")

    It looks like more information is needed to solve the problem. What are the constraints on u and v? Do they need to be parallel, or perpendicular, or something else? If they're just arbitrary vectors, a and b could be anything.
    Please give us yours first...:wink:
  4. Mar 7, 2010 #3
    No need! Done it.
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