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Thread: Discrepancy between Geogrebra, Excel, Desmos, and TI-83 PLUS...what's the deal?

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    Question Discrepancy between Geogrebra, Excel, Desmos, and TI-83 PLUS...what's the deal?




    As my title implies, there is a discrepancy between Geogebra, Excel, Desmos, and TI-83 Plus. Let me explain myself


    I have created a fifth and sixth power regression model through excel to fit two sets of data respectively. Now, I want to calculate the derivatives for both sets of data using my polynomial model. When I go to graph the fifth degree polynomial, all I get on Desmos, Geogebra, and my TI-83 Plus is a vertical line as though the relationship of the data is undefined. On Excel, a rather nice curve comes as the equation of the line.


    How do I resolve this and what does this mean? A response will be hugely appreciated and needed.

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    Re: Discrepancy between Geogrebra, Excel, Desmos, and TI-83 PLUS...what's the deal?

    I don't really understand what you did. And the information you provided doesn't seem to be nearly enough to solve whatever issue you're having.
    I don't have emotions and sometimes that makes me very sad.

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    Re: Discrepancy between Geogrebra, Excel, Desmos, and TI-83 PLUS...what's the deal?

    @Dason

    I collected a set of data points. I entered them on Excel.

    I used those points (x,y) to create a scatter plot and from there, a trend curve. That gave me an equation that is 5th degree for one data set and for another data set.

    I wanted to measure the rate of change but I needed to graph the regression equation given to me by excel, which was a 5th degree polynomial as I mentioned earlier. When I went to graph it on Desmos, Geogebra, and my calculator, a single vertical line was graphed by this fifth degree polynomial. When I graphed it on Excel, a normal fifth degree curve showed up.

    My question is why does the same equation (5th degree) act as a curve in Excel and an undefined line in Desmos, Geogebra, and my calculator. I can't disclose the equation on the Internet because it's for a project.

    I think you should have enough information and my question should make sense now that I've clarified things. P

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    Re: Discrepancy between Geogrebra, Excel, Desmos, and TI-83 PLUS...what's the deal?


    My guess is that you did something wrong when entering the equations but it's impossible to tell. Your question boils down to "something went wrong - can somebody tell me what went wrong without me giving you the actual details".
    I don't have emotions and sometimes that makes me very sad.

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