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2. (p - 4) (p + 9)
3. (p + 4) (p - 9)
4. (y - 3) (y + 24)
5. (4 + x) (4 + x)
6. (18 - x) (2 - x)
7. (a + 9b) (a - 5b)
8. (a - 9b) (a - 4b)