Question

rozwiąż równanie : 5x^3+2x^2-15x-6=0

Answer 1

5x³ + 2x² - 15x - 6 = 0
5x³ - 15x + 2x² - 6 = 0
5x(x² - 3) + 2(x² - 3) = 0
(5x + 2)(x² - 3) = 0
(5x + 2)(x - √3)(x + √3) = 0
5x + 2 = 0 ∨x - √3 = 0 ∨ x + √3 = 0
x = -2/5 ∨ x = √3 ∨ x = -√3