AS/A2 Pure 2 Pure 3

P1 Topic 2: Algebra
Solving quadratic equations by completing the square
The display below shows how this is done. You can change the quadratic function and then see the process, step by step.

Summary Note that this method gives the answers in exact surd form. Notice also that there are two answers. You may be familiar with the formula for finding the roots of quadratic equations. It is based on the above method. This page uses HotEqn.