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12. 9m²-16 = 3²m²-4² = (3m-4)(3m+4)
14. 49-p² = (7-p)(7+p)
16. 64a²-9 = (8a-3)(8a+3)
18. 25p²-16q² = (5p-4q)(5p+4q)
20. 81p²-100q² = (9p-10q)(9p+10q)
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