Education Technology

Quadratics: The Discriminant and the Quadratic Formula (Quiz)

Activity Overview

This interactive quiz first steps students through the derivation of the quadratic formula by completing the square, and then generates random quadratics for which students need to show the steps of solving by first finding the value of the discriminant, and then using it in the formula. There are two levels of difficulty provided. This activity is written using Lua scripting.

Before the Activity

Students should have some experience of the method of completing the square for solving quadratic equations. Some work on solving by factoring may also be suitable.

During the Activity

It is recommended that the teacher first demonstrate the steps involved in working through the quiz, and then allow students to continue at their own pace for as long as desired, either individually or in small groups.

After the Activity

Students should continue with further work on solving quadratics and explore applications, such as solving inequalities and graphical transformations.