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2. (-p-7)(p-7)
3. (3x-4)(3x+4)
4. (8a+3)(8a-3)
5. (4a+2b)(2a-b)
6. (5p+4q)(5p-4q)
7. (6x-9y)(6x+9y)
8. (9p-10q)(9p+10q)