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2. 9a² - 25 = (3a + 5) (3a - 5)
3. 1 - m² = (1 + m) (1 + m)
4.81 - 16y² = (9 + 4y) (9 - 4y)
5. 2a² - 8b² = (2a + 4b) (a - 2b)
6. 12p² - 27q² = (6p + 9q) (2p - 3q)
7. - = (x² + y²) (x² - y²)