The negative root is nonsense in this case but the ball will land almost 3.5 seconds after you throw it. ... > a quadratic equation has always two roots, if complex roots are considered, ...

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

The quadratic equation is an ancient staple of mathematics that dates back to ancient Babylonians in 2000 BC. It was originally devised as a way to help calculate problems involving rectangles ...