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x³ - 2x² - 4x + 8 = 0
x²(x - 2) -4(x - 2) = 0
(x² - 4)(x - 2) = 0
(x + 2)(x - 2)² = 0
x + 2 = 0 ^ x - 2 = 0
x = -2 ^ x = 2
la segunda
4x⁴ + 10x³ - 6x² - 15x = 0
2x³(2x+5) - 3x(2x + 5) = 0
(2x+5)(2x³ - 3x) = 0
(2x+5)x(2x²-3) = 0
2x + 5 = 0 ^ x = 0 ^ 2x²-3 = 0
x = -5/2 x = 0 x = √(3/2)