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2. x² -y² = (x+y) (x-y)
3. b²-1 = (b+1) (b-1)
4. x6 - 4 = (x³+2) (x³-2)
5. 36x² - a6b4 = (6x + a³b2) (6x - a³b²)
6. b² - 64 = (b + 8) (b - 8)
7. 25 - x² = (5 + x) (5 - x)
8. a² - 100 = (a + 10) (a -10)
9. 36x8b12 – 9c10 = (6x4b6 + 3c5) (6x4b6 - 3c5)
10. 4x² - 49 = (2x + 7) (2x - 7)