Edexcel IGCSE Maths 复习笔记 2.3.2 Expanding Two Brackets - Harder
Edexcel IGCSE Maths 复习笔记 2.3.2 Expanding Two Brackets - Harder
Hidden FOIL (aka spot the hidden brackets)
- Always write (a + b)2 as (a + b)(a + b)
Beware of minus signs
- Remember the basic rules:“ − × − = + ”
“ − × + = − ”
How to multiply out two brackets
- Write FOIL above your working spaceF – First term in each bracket
O – Outer pair of termsI – Inner pair of terms
L – Last term in each bracket
- Write down the four MULTIPLICATIONS
Careful here – you have to be sure to include any minus signs!
- Simplify by collecting LIKE TERMS (if there are any)
Worked Example
转载自savemyexam
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