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Math Help - Vectors in three dimensions

  1. #1
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    Vectors in three dimensions

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



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  2. #2
    No one in Particular VonNemo19's Avatar
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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. #3
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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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