Results 1 to 11 of 11

Math Help - Need help please, need very quickly

  1. #1
    Newbie
    Joined
    Oct 2012
    From
    Des Moines, Iowa
    Posts
    22

    Need help please, need very quickly

    An ordered quadruple (y₁,y₂,y₃,y₄) is quadratic if there exists realnumbers a, b, and c such that yn = an+ bn + c
    for n=1,2,3,4
    Prove that if 16 numbers are placed in a 4x4 grid such that all four rows are quadratic
    and the first three columns are also quadratic then the fourth column must also be quadratic.
    (We say that a row is quadratic if its entries, in order, are quadratic. We say the same
    for a column.)
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Sep 2012
    From
    Australia
    Posts
    3,802
    Thanks
    660

    Re: Need help please, need very quickly

    Hey Makaveli.

    Can you explain this grid? If it's a matrix then you can write out the relationship between the cells and the constraints on those cells?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Apr 2012
    From
    Irving TX
    Posts
    42
    Thanks
    1

    Re: Need help please, need very quickly

    I too have the same question, can you please explain about this grid?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Oct 2012
    From
    Des Moines, Iowa
    Posts
    22

    Re: Need help please, need very quickly

    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Oct 2012
    From
    Des Moines, Iowa
    Posts
    22

    Re: Need help please, need very quickly

    Could someone please figure this out and show me how they got the answer please? My test is on Sunday, I have to go into school to take it. Thanks so much.
    Follow Math Help Forum on Facebook and Google+

  6. #6
    MHF Contributor
    Joined
    Sep 2012
    From
    Australia
    Posts
    3,802
    Thanks
    660

    Re: Need help please, need very quickly

    What is in the grid? You just posted an empty grid. What are the constraints of the cells in the grid?
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Newbie
    Joined
    Oct 2012
    From
    Des Moines, Iowa
    Posts
    22

    Re: Need help please, need very quickly

    The empty grid was all that came with the problem- im guessing there are no constraints.
    Follow Math Help Forum on Facebook and Google+

  8. #8
    zhi
    zhi is offline
    Newbie
    Joined
    Oct 2012
    From
    china
    Posts
    1

    Re: Need help please, need very quickly

    Hi Makavell, did you solve the 4th question?
    Follow Math Help Forum on Facebook and Google+

  9. #9
    MHF Contributor MarkFL's Avatar
    Joined
    Dec 2011
    From
    St. Augustine, FL.
    Posts
    1,988
    Thanks
    734

    Re: Need help please, need very quickly

    The way I see it, given that all 4 rows are quadratic, and the first column is also quadratic, then it follows that the remaining 3 columns must also be quadratic.
    Follow Math Help Forum on Facebook and Google+

  10. #10
    Newbie
    Joined
    Oct 2012
    From
    Des Moines, Iowa
    Posts
    22

    Re: Need help please, need very quickly

    Mark, how would a basic proof of that look? Thanks
    Follow Math Help Forum on Facebook and Google+

  11. #11
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    11,863
    Thanks
    639

    Re: Need help please, need very quickly

    cheating ... thread closed
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. need help quickly
    Posted in the Algebra Forum
    Replies: 2
    Last Post: September 9th 2009, 04:04 PM
  2. Please help me quickly
    Posted in the Algebra Forum
    Replies: 1
    Last Post: March 6th 2009, 02:15 AM
  3. need help quickly please
    Posted in the Math Topics Forum
    Replies: 3
    Last Post: June 30th 2006, 06:02 AM
  4. Quickly, help please!
    Posted in the Algebra Forum
    Replies: 4
    Last Post: January 14th 2006, 12:05 PM
  5. [SOLVED] [SOLVED] Need help quickly!
    Posted in the Advanced Algebra Forum
    Replies: 0
    Last Post: November 24th 2005, 12:43 PM

Search Tags


/mathhelpforum @mathhelpforum