Factorising - The Difference Of Two Squares (DOTS) Lesson | GCSE Maths Edexcel IGCSE Higher

Factorising - The Difference Of Two Squares (DOTS)

This lesson covers:

How to factorise expressions using the 'difference of two squares' (DOTS) technique

Factorise x² - 25

(x+5)(x-5)|(x-5)(x+5)

Factorise x² - 9

(x+3)(x-3)|(x-3)(x+3)

Factorise 9p² - 49

(3p+7)(3p-7)|(3p-7)(3p+7)

Factorise 36 - x²

(6+x)(6-x)|(6-x)(6+x)|(-x+6)(x+6)|(x+6)(-x+6)

Use the difference of two squares technique to factorise:

4 $a$ ²- 100 $b$ ²

(2a+10b)(2a-10b)|(2a-10b)(2a+10b)

Factorise 25p⁴- 81

(5p^2+9)(5p^2-9)|(5p^2-9)(5p^2+9)

Factorise 16 $a$ ⁴- 25 $b$ ²

(4a^2+5b)(4a^2-5b)|(4a^2-5b)(4a^2+5b)