Learn about and revise quadratic equations by factorising, completing the square and using the quadratic formula with GCSE Bitesize OCR Maths.

Revise solving quadratic equations for your maths GCSE foundation and higher exams with Bitesize interactive practice quizzes covering feedback and common errors.

Before students are presented with the quadratic formula, they’re taught a simpler method to solve certain equations. For simplicity, we’ll consider an equation where a = 1. x ² – 4 x – 5 = 0 ...

But he systematically set out word-­form linear and quadratic equations, with algorithmic methods for solving them — that is, for finding the "unknown numbers," our modern x's and y's.

How the New Method Works. This alternate method for solving quadratic equations uses the fact that parabolas are symmetrical. For example, in the parabola y = x² – 4x – 5 the two solutions ...