3x2 - 11x - 4 = 0 D = b2 - 4ac D = 121 + 48 = 169 = 13^2 x1,2 = -b ± √D/2a x1 = 11 + 13/6 = 24/6 = 4 x2 = 11 - 13/6 = - 2/6 = - 1/3 Ответ: x1 = 4 ; x2 = - 1/3