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2. x²-25 =(x-5)(x+5)
3. 49-x² = (7-x)(7+x)
4. 81x² - 169 = (9x-13)(9x+13)
5. x²-36y² = (x-6y)(x+6y)
6. 81-x² = (9-x)(9+x)
7. a²-4b² = (a-2b)(a+2b)
8. 4x²-49y² = (2x-7y)(2x+7y)
9. 25p² - 16q² = (5p-4q)(5p+4q)
10. p²-q² = (p-q)(p+q)
2. (x - 5) (x + 5)
3. (7 + x) (7 - x)
4. (9x - 13) (9x + 13)
5. (x - 6y) (x + 6y)
6. (9 - x) (9 + x)
7. (a - 2b) (a + 2b)
8. (2x - 7y) (2x + 7y)
9. (5p - 4q) (5p + 4q)
10. (p - q) (p + q)