University of Illinois
University of Illinois: Quadratic Formula
This site from the University of Illinois offers an excellent simulation of the quadratic formula, where you can type in different values for a, b, and c, and then view the change in the answer for x.
Department of Defense
Do Dea: Spreadsheet Software: M2: L5: Show Me Your Skills: Practice Skills
In Module 2 Lesson 5 of this course on spreadsheets, students review what they have learned in the previous four lessons about formulas, functions, and manipulating a spreadsheet. Content is stored in the Resources section. Practice...