EXERCISE 7B
Factorise:
1. x - 36
4. 4x2-9y
7. 16a -144
2. 4a2-9
5. 16a? - 225b2
8. 63a? -112b?
3. 81 - 49x
6. 9a²b2 - 25
g. 20a? -45b?
105 14473
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