Odpowiedź:
(x² - 9)(x² - 4) = 0
(x - 3)(x + 3)(x - 2)(x + 2) = 0
x - 3 = 0 ∨ x + 3 = 0 ∨ x - 2 = 0 ∨ x + 2 = 0
x = 3 ∨ x = - 3 ∨ x = 2 ∨ x = - 2
x₀ = {- 3 , - 2 , 2 , 3 }
