1. (a-6)(a + 6)
2. (3x - 5)(2x + 7)
3. (5a² - 1) (2a + 1)
4. (8m + 3n) (3n - 8m)
5. (x+3)(x-7) - 4x(5-2x)
6. (2x - 5y) (2x + 5y) + (5x - 2y)(5x + 2y)
7. (5a³ + 7b) (2a5 - b) - (2a¹ + 5b) (5b - 2a¹)
8. (-aª -b5) (a¹ - b5) (a³ + b¹⁰)
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