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Vector proof

  1. Nov 7, 2008 #1
    For all u, v,w, we have v × u = −(u × v) and (u + v) × w = (u × w) + (v × w).

    Apply these facts to prove, without using co-ordinates, that for all vectors u, v,w, we have

    u × (v + w) = (u × v) + (u × w).

    I need help, do not know were to start.

    Thaks
     
  2. jcsd
  3. Nov 7, 2008 #2

    Dick

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    Start with ux(v+w)=-(v+w)xu. Do you see why you can do that? It's your first property.
     
  4. Nov 7, 2008 #3
    Oh, ok i see what you have done. Know it should easy for me 2 prove this.

    Thanks for the help
     
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