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12. (3m+4)(3m-4)
13. (1+×)(1-×)
14. (7+p)(7-p)
15. (3x+4)(3x-4)
16. (8a+3)(8a-3)
17. 2(4a² - b²) = 2(2a+b)(2a-b)
18. (5p+4q)(5p-4q)
19. 9(4x² - 9y²) = 9(2x+3y)(2x-3y)
20. (9p+10q)(9p-10q)
ctt: a² - b²= (a+b)(a-b)