## Quadratic Equations

All quadratic equations have the form ax

^{2}+ bx + c = 0 where a ≠ 0

If a quadratic equation factorises then we can solve it by using a factorising method as shown in this video.

Quadratic Equations - Solution by Factorising | ExamSolutions - youtube Video

In this tutorial you are shown how to solve a quadratic equation by using the method of completing the square. This is often used when a quadratic equation does not factorise.

How to Solve a Quadratic Equation by Completing the Square : ExamSolutions - youtube Video

Some quadratic equations cannot be solved by factorising and so an alternative method is the quadratic formula. It is based on a method called completing the square.

This tutorial shows you when to use it, clues that are given in a question and common mistakes that are often made.

How to solve a quadratic equation by the quadratic formula : ExamSolutions Maths Revision - youtube Video

## How to Derive the Quadratic Formula

How to derive the Quadratic Formula : ExamSolutions Maths Revision - youtube Video