5x(3x+7)(4x+1)2=-19x+63

5 * x * ( 3 * x + 7 ) * (4 * x + 1 ) * 2 = - 19 * x + 63;
(5 * x * 3 * x + 5 * x * 7 ) * (2 * 4 * x + 1 * 2 ) = - 19 * x + 63;
(15 * x ^ 2 + 35 * x ) * (8 * x + 2 ) = - 19 * x + 63;
(15 * x ^ 2 * 8 * x + 35 * x * 8 * x + 15 * x ^ 2 * 2 + 35 * x * 2 ) = - 19 * x + 63;
(120 * x ^ 3 + 280 * x ^ 2 + 30 * x ^ 2 + 70 * x ) = - 19 * x + 63;
120 * x ^ 3 + 310 * x ^ 2 + 89 * x - 63 = 0;
Отсюда:
x 1 = - 2 . 115;
x 2 = 0 . 316;
x 3 = - 0 . 784;
Ответ: x 1 = - 2 . 115;
x 2 = 0 . 316;
x 3 = - 0 . 784;