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(1 + x)(1 - x)
2) 49 - p²
(7 + p)(7 - p)
3) 9x² - 16
(3x + 4)(3x - 4)
4) 64a² - 9
(8a + 3)(8a - 3)
5) 8a² - 2b²
(4a + 2)(2a - 1)
6) 25p² - 16p²
9p²
(3p)(3p)
7) 36x² - 81y²
(6x + 9y)(6x - 9y)
8) 81p² - 100q²
(9p + 10q)(9p - 10q)