Найдите корни уравнения (4,9 + 3,5х)(7х – 2,8) = 0
(4.9 + 3.5x)(7x - 2.8) = 0 4.9 + 3.5x = 0 3.5x = -4.9 x = -4.9 : 3.5 x_1 = -1.4 7x - 2.8 = 0 7x = 2.8 x_2 = 0.4 Ответ: x_1 = -1.4 ; x_2= 0.4