Results 1 to 2 of 2

Math Help - Perpendicular vectors

  1. #1
    Member
    Joined
    Sep 2009
    Posts
    162

    Perpendicular vectors

    I have a question dealing with perpendicular vectors. In the book it states this;

    10. Find a vector that is perpendicular to both given vectors.
    a) u = [1, 2, 3], v = [3, 2, 1]

    The answer I got was n = [1, -2, 1] but the book has it as a multiple of -4, which is [-4, 8, -4]. Why is it -4?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,607
    Thanks
    1574
    Awards
    1
    Quote Originally Posted by Barthayn View Post
    10. Find a vector that is perpendicular to both given vectors. a) u = [1, 2, 3], v = [3, 2, 1]
    The answer I got was n = [1, -2, 1] but the book has it as a multiple of -4, which is [-4, 8, -4]. Why is it -4?
    The book's answer happens to be u\times v.
    But any multiple of that vector is also a correct answer.
    So yours is correct,
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Perpendicular Vectors
    Posted in the Advanced Algebra Forum
    Replies: 5
    Last Post: May 4th 2011, 04:21 PM
  2. Perpendicular vectors
    Posted in the Algebra Forum
    Replies: 2
    Last Post: May 30th 2010, 10:24 AM
  3. Vectors (Perpendicular vectors) problem
    Posted in the Algebra Forum
    Replies: 3
    Last Post: May 30th 2010, 09:45 AM
  4. Perpendicular vectors
    Posted in the Math Topics Forum
    Replies: 5
    Last Post: October 25th 2009, 11:03 AM
  5. Perpendicular Vectors
    Posted in the Calculus Forum
    Replies: 1
    Last Post: August 31st 2009, 05:13 PM

Search Tags


/mathhelpforum @mathhelpforum