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Math Help - Vector Property

  1. #1
    Member billa's Avatar
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    Vector Property

    Show that A.(B+C)=A.B+A.C using anything but the coordinate definition of the dot product.

    Any ideas?

    Thanks
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  2. #2
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    Quote Originally Posted by billa View Post
    Show that A.(B+C)=A.B+A.C using anything but the coordinate definition of the dot product.

    Any ideas?

    Thanks
     A.(B+C) = |A||(B+C)|cos(\theta)

    Use that definition.
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  3. #3
    Member billa's Avatar
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    I tried to use that, but couldn't. I know I need to show that

    |A||B+C|cos(theta)=|A||B|cos(a1)+|A||C|cos(a2)

    but I can't come up with any relationships between the angles (or anything else for that matter).
    Last edited by billa; May 16th 2009 at 02:54 PM. Reason: it was confusing
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