Creating a graph based on a quadratic equation.

To create a scatter chart, you need two columns (or rows) of data, one being X and the other being Y. So, in Column B put the X values you would like plotted. In Column C put your equation to calculate Y for each of those points.

B2 =1
B3 =2
etc

C2 =B2^2 3*B25
then fill down to fill in the rest of the rows in the column.

I'd recommend a look at the Numbers user's manual if the above doesn't make sense.

If you have plotted some X-Y data and want the trendline equation, you can turn on a trendline and have it display the equation. You can't use the coefficients from the equation unless you read them off the chart and type them into your table manually. However, you can calculate the trendline yourself in your table. That was covered in some depth in a thread from a little while back. Here's the link to that thread:

http://discussions.apple.com/thread.jspa?messageID=9015541&#9015541

conielo,

The Mac OS has an application for graphing functions. It's in the Utilities folder and it's called Grapher.app.

I think you will find this special-purpose program much easier than using Numbers.

Jerry

I'd forgotten all about that app. It's pretty nice.