# Edexcel IGCSE Maths 复习笔记 2.2.2 Simple Factorisation

#### What is simple factorisation?

Simple Factorisation is the opposite of Expanding One Bracket

#### Beware of minus signs

Remember the basic rules:

“ − × − = + ”

“ − × + = − ”

#### How to factorise

• Write each term in factorised form
• Identify the common factors
• Write those factors outside a bracket
• Write everything else inside the bracket