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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