Odpowiedź:
2x³ + 3x² - 10x - 15 = 0
x²(2x + 3) - 5(2x + 3) = 0
(2x + 3)(x² - 5) = 0
2x + 3 = 0 v x² - 5 = 0
2x = - 3 v (x -5)(x+5) = 0
x = - 1,5 v x - 5 = 0 v x + 5 = 0
x = - 1,5 v x = 5 v x = -5
