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Homework Help: Vector definition, need help

  1. Nov 18, 2012 #1
    Hi For some strange reason I just can't see why this is true?? Can anyone help me explain why the left side can be written as the right side? I added a picture.
     

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  2. jcsd
  3. Nov 18, 2012 #2
    The thing that confuses me the most is the p-tu.
     
  4. Nov 18, 2012 #3

    HallsofIvy

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    It's just the associative law for addition of vectors:
    (v- p)+ (p- tu)= v+ (-p+ p)- tu= v- tu.
     
  5. Nov 18, 2012 #4
    Ahh that's the trick huh? So is (v- p)+ (p- tu) a geometric figure? Or just something to be considered as numbers.
     
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