Объяснение:

[tex]1)b {}^{2} - d {}^{2} = (b - d)(b + d) \\ 2)x {}^{2} - 1 = (x - 1)(x + 1) \\ 3) - x {}^{2} + 1 = - (x - 1)(x + 1) \\ 4)36 - c {}^{2} = (6 - c)(6 + c \\ 5)4 - 25a {}^{2} = (2 - 5a)(2 + 5a) \\ 6)49a {}^{2} - 100 = (7a - 10)(7a + 10)[/tex]