Quadratics
Key Facts
You should know the following:
- A quadratic is normally given in one of three forms: (expanded / normal form) (factorised form) (completed square form)
- The quadratic formula, , can be used to find the solution(s) to any quadratic equation (if it has any), and must be learned off by heart.
- The discriminant, , indicated the number of roots: means two roots; means one root; means no real roots.