25x² - y² = (5x - y)(5x + y)
-m² + 16n² = 16n² - m² = (4n - m)(4n + m)
36a² - 49 = (6a - 7)(6a + 7)
64 - 25x² = (8 - 5x)(8 + 5x)
9m² - 16n² = (3m - 4n)(3m + 4n)
64p² - 81q² = (8p - 9q)(8p + 9q)
-49a² + 16b² = 16b² - 49a² = (4b - 7a)(4b + 7a)
0,01n² - 4m² = (0,1n - 2m)(0,1n + 2m)
9 - b²c² = (3 - bc)(3 + bc)
4a²b² - 1 = (2ab - 1)(2ab + 1)
p² - a²b² = (p - ab)(p + ab)
16c²d² - 9a² = (4cd - 3a)(4cd + 3a)