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Math Help - vector problem

  1. #1
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    vector problem

    could someone tell me of this answer is correct:
    the triangle ABC has verticies A(-1,3,0), B(-3,0,7), C(-1,2,3). Find a) AB

    A: 21i+10j-9k ?

    cheers.
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  2. #2
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    Quote Originally Posted by hyzlemon View Post
    could someone tell me of this answer is correct:
    the triangle ABC has verticies A(-1,3,0), B(-3,0,7), C(-1,2,3). Find a) AB

    A: 21i+10j-9k ?

    cheers.
    No, that's completely wrong! "AB" is NOT a multiplication- you do not "multiply" points- it is the vector from A to B: (-3-(-1))i+ (0- 3)j+ (7- 0)k.
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  3. #3
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    ok thanks, that was actually my original answer but i was told that it was wrong for some reason, by a phd student aswell.
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