Разложите многочлен на множители:
а) $(3x + 1)^2 - (4x + 3)^2$;
б) $(6y - 7)^2 - (9y + 4)^2$;
в) $(15z + 4)^2 - (3z - 2)^2$;
г) $(13t - 9)^2 - (8t - 7)^2$.
$(3x + 1)^2 - (4x + 3)^2 = (3x + 1 - (4x + 3))(3x + 1 + 4x + 3) = (3x + 1 - 4x - 3)(7x + 4) = (-x - 2)(7x + 4) = -(x + 2)(7x + 4)$
$(6y - 7)^2 - (9y + 4)^2 = (6y - 7 - (9y + 4))(6y - 7 + 9y + 4) = (6y - 7 - 9y - 4)(15y - 3) = (-3y - 11)(15y - 3) = -3(3y + 11)(5y - 1)$
$(15z + 4)^2 - (3z - 2)^2 = (15z + 4 - (3z - 2))(15z + 4 + 3z - 2) = (15z + 4 - 3z + 2)(18z + 2) = 2(12z + 6)(9z + 1) = 12(2z + 1)(9z + 1)$
$(13t - 9)^2 - (8t - 7)^2 = (13t - 9 - (8t - 7))(13t - 9 + 8t - 7) = (13t - 9 - 8t + 7)(21t - 16) = (5t - 2)(21t - 16)$
Пожауйста, оцените решение