А)3ху + 3х - 4 - 4у = 3x(u + 1) - 4(1 + у) = 3x(u + 1) - 4(у + 1) = (3x - 4)(у + 1)
Б)49n^2 - (3n + 1)^2 = (7n - 3n - 1)(7n + 3n + 1) = (4n - 1)(6n + 1)
А)
3ху + 3х - 4 - 4у = 3x(u + 1) - 4(1 + у) = 3x(u + 1) - 4(у + 1) = (3x - 4)(у + 1)
Б)
49n^2 - (3n + 1)^2 = (7n - 3n - 1)(7n + 3n + 1) = (4n - 1)(6n + 1)