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Math Help - A vector equation question..

  1. #1
    Junior Member
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    Oct 2010
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    A vector equation question..

    I have this question. I'll go through the previous parts so you have an idea of what it's asking.

    Given u = (4, 0, -2), v = (3, 1, -1), w = (2, 1, 6) find

    (a) the angle between u and w (98 degrees)

    (b) the component of u along v (14/11)

    (c) the projection of v along w 1/41(2,1,6) i.e (2/41, 1/41, 6/41)


    And finally (d) a vector constructed from (c) and perpendicular to w

    I'm struggling with this final part... I just don't understand it..
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  2. #2
    Junior Member
    Joined
    Oct 2010
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    Ok well I have attempted it.

    I guess as the vector is perpendicular to w, then w. (another vector) = 0.

    Now the vector is constructed from the projection of v along w. I have tried (2,1,6) . lambda (2/41, 1/41, 6/41) but got no where..

    Am I along the right lines?
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