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Math Help - Quadratic

  1. #1
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    Quadratic

    Could someone please help..i do not quite understand the question:

    I determined that it is a quadratic equation...but i do not know how to do the second part of this...thank you!
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  2. #2
    Eater of Worlds
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    Do you have Excel?. It does a fine job with these things. But here's my Voyage 200 screen capture.

    You're given a mess of x and y coordinates. Enter them in a calculator, Excel, whatever.
    Last edited by galactus; November 24th 2008 at 05:39 AM.
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  3. #3
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    I have a graphing calculator....Thats the trouble that i am having, i put the number into the chart and i get an error message...is it because one of the numbers is a 0?
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  4. #4
    Eater of Worlds
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    No, 0 doesn't matter. As you can see, mine done it fine.

    Make sure you have the same number of entries in x as in y, otherwise, you'll get an error.

    y=-0.01233x^{2}+0.208242x+7.527473
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  5. #5
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    line regression

    using your graphing calculator, at least a TI-83, go to the STAT button. Go to edit and you will see columns, for L1 enter your x-coordinates and for L2 enter your y-coordinates. That being done press the second button then the Y= button at the top. You need to press PLOT1 and make sure that it is on. For type, make sure it is a scatter plot. Then you can adjust your viewing window to see it. Now, to find an equation that is needed, go to STAT, scroll at the top to where it says CALC and pick QuadReg, that will give you an equation with the least regression
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  6. #6
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    Thank you very much
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