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Math Help - Simple Vector

  1. #1
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    Simple Vector

    Hey guys, wasnt too sure which section to post this in but since its a simply question, id thought u wouldnt mind if i posted it here.

    My question is that if i have point A (3,1,1) and point B (2,-3,5), how do i construct a vector from this points.
    So for instance, i need to find
    vector AB, would this be = (-3+2,-1-3,-1-5)
    vector BA, would this be = (3-2,3+1,1-5)

    In my text book this seems to be the methods but no way does it state that if u need vector AB, then u substract vector A from vector B. Is this right?
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  2. #2
    Senior Member nikhil's Avatar
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    vector AB=B-A
    where A and B are position vectors
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  3. #3
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    Okay, so:

    BA = A - B
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