Edexcel IGCSE Maths 复习笔记 2.4.3 Difference of Two Squares

Edexcel IGCSE Maths 复习笔记 2.4.3 Difference of Two Squares

What is the difference of two squares?

  • A “Difference Of Two Squares” is any expression in the form p2 – q2

Why is it so important?

  • It comes up a lot – recognising it can save a lot of time

How does it factorise?

  • p2 – q2 can always be factorised in the same way:p2 – q2 = (p + q)(p – q)

    (Try multiplying it out to see why…)

Worked Example

转载自savemyexam

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