1. Go to Geogebra.org.
  2. Click on Geogebra Math Apps.
  3. Choose Spreadsheet.
  4. Enter your data in the spreadsheet.
    geogebra-spreadsheet

  5. Click in the graph area, then right click and choose Graphics.
  6. In the Basic tab, change your x- and y- mins and maxes to represent your data points.

    geogebra-graph-settings

  7. Click on the Grid tab and Show Grid if you want. Then click the X to close the properties dialog box.
  8. Highlight your data in the spreadsheet, then right click on it.
  9. Choose Create > List of Points.

    geogebra-data-plotted

  10. Click on the Menu icon in the upper right and choose View and check Input Bar.
  11. The Input Bar appears in the bottom of your screen. Type y=a*(x-h)^2 + k and press Enter. When a dialog box pops up, click Create Sliders.
  12. Click on a slider and choose the Set label style button to show the Name and Value.

    geogebra-name-sliders

  13. Right click on a slider and choose Object Properties. Adjust the Min: and Max: and Increment: for each of your three sliders to reflect your data.

    geogebra-slider-settings

  14. Move your sliders until they represent your data. Note your equation.
  15. To see how your equation compares to the one Geogebra calculates, select the data in the spreadsheet.
  16. Choose the table – bar graph icon. Choose Two Variable Regression Analysis.

    geogebra-two-variable-regression-analysis

  17. The data from this table most closely represents a quadratic so choose Polynomial.

    geogebra-polynomial-regression

  18. How did the equation you created using the sliders compare to the Geogebra Regression Model?