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Factorising common factors

Stuck? Read the notes

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Factorise the expressions below.

1. 2x + 4
2. 4x -8
3. 16x + 4y
4. 2x -6u
5. 8xy + 12x
6. 8tu + 18t
7. 9x^{2} + 7x
8. 18y + 8y^{2} + 14y^{3}
9. 4x + 12xy
10. 8x + 4

Factorise the more difficult expressions below.

11. 24xy + 9x^{2} -15x
12. 24tu + 20tz + 4t
13. 6z^{3} + 19z^{2}
14. 7u^{7} + 4u^{9}