Question

Решите 6x^3-5x^2-25x+28=0

Answer 1

Ответ: x=-корень(57)/4-1/4, x=4/3, x=корень(57)/4-1/4

Answer 2

6x^3 - 5x^2 - 25x + 28 = 0
6x^3 - 8x^2 + 3x^2 - 4x - 21x + 28 = 0
(3x - 4)(2x^2 + x - 7) = 0
x1 = 4/3
2x^2 + x - 7 = 0
D = 1 + 4*2*7 = 1 + 56 = 57
x2 = (-1 - √57)/4
x3 = (-1 + √57)/4