-2х² - 5х - 2 = 0,
Д = (-5)² - 4*(-2)*(-2) = 25 - 16 = 9,
х1 = (5+3)/2*(-2) = -8/4 = -2,
х2 = (5-3)/2*(-2) = -2/4 = -1/2 (или -0,5),
-3х² - 10х - 3 = 0,
Д = (-10)² - 4*(-3)*(-3) = 100 - 36 = 64,
х1 = (10+8)/2*(-3) = -18/6 = -3,
х2 = (10-8)/2*(-3) = -2/6 = -1/3