[login]

• Home
• News
• Calendar
• Key stage 3
  • Year 7
  • Year 8
  • Year 9
• Key stage 4
• Key stage 5
• Practice
• Games
• My page

Quick links

• KS3 Notes
• Help sheets
• Dos and don'ts

External links

• BBC Maths File
• Easymaths
• Waldomaths
• MyMaths

Difference of two squares (DOTS)

Stuck? Read the notes

	Answers
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

Factorise fully the expressions below.

1. x^{2} - 36
2. x^{2} - 25
3. x^{2} - 144
4. x^{2} - 49
5. x^{2} - 225
6. x^{2} - 16
7. x^{2} - \frac{1}{81}
8. x^{2} - 9

Factorise fully the expressions below.

9. 25x^{2} - 4
10. 4x^{2} - 225
11. 9x^{2} - 169
12. 36x^{2} - 121
13. 225x^{2} - 169
14. c^{2} - x^{2}
15. 9c^{2} - 4y^{2}
16. 81x^{2} - 100a^{2}