F' = 3X^2 + 4X - 5 F' = 0 D = 16 -4*3*(-5) = 16+ 60 = 76 V D = 8.7 X1 = - 4 + 8.7 \ 6 = 4.7\6 = 0.78 X2 = - 4 - 8.7 \ 6 = - 2.11 Сумма корней 0.78 - 2.11 = - 1.33