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Find a nonzero vector u with initial point P(-1.3.-5) such that

  1. Apr 10, 2009 #1
    Find a nonzero vector u with initial point P(-1.3.-5) such that
    (a) u has the same direction as v = (6,7,-3)
    (b) u is oppositely directed to v = (6,7,-3)
     
  2. jcsd
  3. Apr 11, 2009 #2

    tiny-tim

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    Welcome to PF!

    Hi dola! Welcome to PF! :wink:

    Show us what you've tried, and where you're stuck, and then we'll know how to help!

    Try (a) first. :smile:
     
  4. Apr 11, 2009 #3
    Re: vector

    ---->
    Let, the terminal point of u is Q(x,y,z)
    Thus u = vector PQ = (x+1, y-3, z+5)

    (a) u will have the same direction as v
    so, (x+1, y-3, z+5) = (6,7,-3)

    x = 5, y = 10, z = -8

    Thus one possible ans might be Q(5,10,-8)

    (b) u will have the opposite direction as v
    so, (x+1, y-3, z+5) = (-6,-7,3)

    x = -7, y = -4, z = -2

    Thus one possible ans might be Q(-7, -4, -2)


    I am not sure whether the procedure is correct. Waiting for explanation
     
  5. Apr 11, 2009 #4

    tiny-tim

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    Yup, that's fine … both method and result! :biggrin:
     
  6. Apr 11, 2009 #5
    Re: vector

    Thank you
     
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