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Thread: Vectors in three dimensions

  1. May 4th 2009, 04:14 PM #1
    ep78
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    Vectors in three dimensions

    find the value of k if (2,k,-3) and (4,2,6) are perpendicular



    Thank you
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  2. May 4th 2009, 04:48 PM #2
    VonNemo19
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    Doesn't the two coordinates you gave correspond to 2 points in space?
    If so, how can 2 points be perpidicular?
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  3. May 4th 2009, 05:26 PM #3
    skeeter
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    Quote Originally Posted by ep78 View Post
    find the value of k if (2,k,-3) and (4,2,6) are perpendicular
    two vectors are perpendicular if their dot product = 0

    \langle 2,k,-3 \rangle \bullet \langle 4,2,6 \rangle = 8 + 2k - 18 = 0

    solve for k
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