Объяснение:
(x + 6)(x + 5) = x² + 5x + 6x + 30 = x² + 11x + 30 D = 1 x1 = -6 x2 = 5
(2y - y))(y - 8) = 2y² - 16y - y² + 8y = y² - 8y
(a - 4)(a + 1) = a² + a - 4a - 4 = a² - 3a - 4 D = 25 x1 = -1 x2 = 4
(a - 4)(2a + 1) = 2a² + a - 8a - 4 = 2a² - 7a - 4 D = 81 x1 = -0.5 x2 = 4
(2y - 1)(3y + 2) = 6y² + 4y - 3y - 2 = 6y² + y - 2 D = 49 x1 = -8/12 x2 = 0.5
Объяснение:
(x + 6)(x + 5) = x² + 5x + 6x + 30 = x² + 11x + 30 D = 1 x1 = -6 x2 = 5
(2y - y))(y - 8) = 2y² - 16y - y² + 8y = y² - 8y
(a - 4)(a + 1) = a² + a - 4a - 4 = a² - 3a - 4 D = 25 x1 = -1 x2 = 4
(a - 4)(2a + 1) = 2a² + a - 8a - 4 = 2a² - 7a - 4 D = 81 x1 = -0.5 x2 = 4
(2y - 1)(3y + 2) = 6y² + 4y - 3y - 2 = 6y² + y - 2 D = 49 x1 = -8/12 x2 = 0.5