# Quadratic expressions

- Created by: Kat
- Created on: 19-05-13 15:18

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**Factorising quadratic expressions**

- Puts it back into its brackets
- Form (x+p) (x+q) - p+q=a and pq=b
- Once the quadractic expression has been factorised it can be used to solve the equation i.e. (x+2) (x+4) = 0 -- x=-2 or x=-4
- Always use the negative reciprocal of the number for the answer as shown above

**Completing the square**

- In an exam, they will either ask you to give your answer to a specified number or…

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