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Adding and subtracting vectors

  1. Oct 20, 2012 #1
    1. The problem statement, all variables and given/known data
    The diagram below shows 3 vectors which sum to zero, all of equal length. What is
    [itex]\vec{A}[/itex] - [itex]\vec{B}[/itex]?

    http://s3.amazonaws.com/diigo/thumb...RL]http://www.diigo.com/item/image/2sb3i/jw3s

    2. Relevant equations

    I don't know but :

    [itex]\vec{A}[/itex] - [itex]\vec{B}[/itex] = [itex]\vec{A}[/itex] + (-[itex]\vec{B}[/itex])


    3. The attempt at a solution

    I have no idea.
     
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Oct 20, 2012 #2

    Andrew Mason

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    What is [itex]\vec C + \vec A[/itex]? What would you have to add to that result to get [itex]\vec A - \vec B[/itex] ?

    AM
     
    Last edited by a moderator: May 6, 2017
  4. Oct 20, 2012 #3

    tiny-tim

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    Welcome to PF!

    Hi Ammar w! Welcome to PF! :smile:

    Draw -B …

    what does it look like? :wink:
     
  5. Oct 20, 2012 #4
    Thank you Andrew Mason & tiny-tim
    C+A=-B // add A to the sides of the equatoin
    C+2A=A-B
    A-B = C+2A.
    I didn't draw anything.
    Thanks for let me thinking.
     
  6. Oct 20, 2012 #5
    Thank you Andrew Mason & tiny-tim
    C+A=-B // add A to the sides of the equatoin
    C+2A=A-B
    A-B = C+2A.
    I didn't draw anything.
    Thanks for let me thinking.
     
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