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Factorising common factors

Stuck? Read the notes

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Factorise the expressions below.

1. 2x + 4
2. 3x -12
3. 16x + 4y
4. 4x -12u
5. 8xy + 18x
6. 8tu + 12t
7. 3x^{2} + 4x
8. 24y + 27y^{2} + 15y^{3}
9. 4x + 12xy
10. 8x + 2

Factorise the more difficult expressions below.

11. 14xy + 4x^{2} -18x
12. 16tu + 18tz + 2t
13. 7z^{3} + 17z^{2}
14. 7u^{5} + 4u^{7}