Economist Glen Weyl says that he has a better idea: bolstering democracy with a few well-placed quadratic equations. Steven Levitt, of “Freakonomics” fame, calls Dr. Weyl’s proposal “so ...

Learn and revise how to solve quadratic equations by factorising, completing the square and using the quadratic formula with Bitesize GCSE Maths Edexcel.

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

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 ...