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Math Help - Vector Expressions

  1. #1
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    Vector Expressions

    u (3,-1,4) v (5,2,-1) w (8,1,-2)

    Evaluate each expression

    l u x v l squared + (w dot w)

    l u x v l squared -lvl squared lul squared
    Last edited by peon123; May 24th 2009 at 01:10 PM.
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  2. #2
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    Quote Originally Posted by peon123 View Post
    u (3,-1,4) v (05,2,-1) w (8,1,-2)

    Evaluate each expression

    l u x v l squared + (w dot w)

    l u x v l squared -lvl squared lul squared
    What part or parts do you have trouble doing?
    These are rather simple.
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  3. #3
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    is l u x v l squared same thing as ( lul x lvl) squared? so just multiply the magnitudes and square them?
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  4. #4
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    Quote Originally Posted by peon123 View Post
    is l u x v l squared same thing as ( lul x lvl) squared? so just multiply the magnitudes and square them?
    u \times v is the cross product of the vectors.
    Find that product then its length.
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