Question

Решить уравнение 50 баллов
3х^3-4х^2+5х-18=0

Answer 1

(3x³ - 24) - (4x² - 5x - 6)= 0
3(x³ - 8) - (4x² - 5x - 6) = 0
3(x-2)(x² +8x+64) - 4(x-2)(x+0,75) = 0
(x-2)(3x² + 24x + 192 - 4x - 3) = 0
(x-2)(3x² +20x + 189) = 0
x - 2 = 0                                               3x² + 20x + 189 = 0
x = 2                                                     D/4 = 10² - 189*3 <0
                                                              решений нет

Answer 2

Спасибо