# 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.

## Step-by-Step: Completing the Square

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