a) 2x³ - 2x = 0
2x(x² - 1) = 0
2x(x - 1)(x + 1) = 0
2x = 0 или x - 1 = 0 или x + 1 = 0
x = 0, x = 1, x = -1
б) x⁵ + 5x⁴ = 0
x⁴(x + 5) = 0
x⁴ = 0 или x + 5 = 0
x = 0, x = -5