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Math Help - Need help for this Polynomial

  1. #1
    Newbie
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    Need help for this Polynomial

    Hi,
    these are all info i have.

    x 3 5 8 6 9
    y 1 5.5 6 7 2.5
    A polynomial made this text
    So find it out and solve for x

    can somebody help me please

    regards
    helmut
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  2. #2
    Grand Panjandrum
    Joined
    Nov 2005
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    someplace
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    Quote Originally Posted by woisau View Post
    Hi,
    these are all info i have.

    x 3 5 8 6 9
    y 1 5.5 6 7 2.5
    A polynomial made this text
    So find it out and solve for x

    can somebody help me please

    regards
    helmut
    Start by assuming its a quadratic:

    y=ax^2+bx+c

    Sort the data points into scending order for x.

    Put the values for the first third and fifth data points into this which will give you a set of three simultaneous equations for this, which you can solve for a,b and c.

    Alternativly look up quadratic regression on Google.

    If you don't want a quadratic fit you can repeat the first method for a cubic or quartic.

    It would also help if you provided more background information on the source of this question.

    CB
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