Plotting Intersections of curves

There are three cases:

1) The discriminant is equal to a positive number.

2) The discriminant is equal to zero.

3) The discriminant is equal to a negative number.

(The above files are Adobe Acrobat files. If you don't have the Adobe Acrobat reader, you can get one free at www.adobe.com)

Here's an example in straight text -- you should be able to read this on any computer!