1) (3b-5)² - 49 = (3b - 5)² - 7² = (3b - 5 - 7)(3b - 5 + 7) = (3b - 12)(3b + 2) = 3(b-4)(3b+2)
2) (a + b)⁶ – (a - b)⁶ = ((a+b)³)² - ((a-b)³)² = ((a+b)³ - (a-b)³)((a+b)³ + (a-b)³) = (a³ + 3a²b + 3ab² + b³ - (a³ - 3a²b + 3ab² - b³))(a³ + 3a²b + 3ab² + b³ + a³ - 3a²b + 3ab² - b³) = (a³ + 3a²b + 3ab² + b³ - a³ + 3a²b - 3ab² + b³)(a³ + 3a²b + 3ab² + b³ + a³ - 3a²b + 3ab² - b³) = (6a²b + 2b³)(2a³ + 6ab²) = 4(3a²b + b³)(a³ + 3ab²)
Ответ:
1) 3(b-4)(3b+2)
2) 4(3a²b + b³)(a³ + 3ab²)