Odpowiedź :
Odpowiedź:
7x³ + 2x² - 14x - 4 = 0
x²(7x + 2) - 2(7x +2) = 0
(7x + 2)(x² - 2) = 0
(7x + 2)(x - √2)(x + √2) = 0
7x + 2 = 0 ∨ x - √2 = 0 ∨ x + √2 = 0
x = - 2/7 ∨ x = √2 ∨ x = - √2
suma pierwiastków = - 2/7 + √2 - √2 = - 2/7
Odpowiedź:
7x³ + 2x² - 14x - 4 = 0
x²(7x + 2) - 2(7x +2) = 0
(7x + 2)(x² - 2) = 0
(7x + 2)(x - √2)(x + √2) = 0
7x + 2 = 0 ∨ x - √2 = 0 ∨ x + √2 = 0
x = - 2/7 ∨ x = √2 ∨ x = - √2
suma pierwiastków = - 2/7 + √2 - √2 = - 2/7