Question

помогите решить уравнение:
x^3 - 4x^2 - 7x + 28 = 0

Answer 1

x³ - 4x² - 7x + 28 = 0
x²(x - 4 ) - 7(x - 4) = 0
(x - 4)*(x² - 7) = 0
x - 4 = 0
x₁ = 4
x² - 7 = 0
x² = 7
x₂ = - √7
x₃ = √7