2X + 8 = X^2 X^2 - 2X - 8 = 0 D = 4 - 4*1*(-8) = 4 + 32 = 36 ; V D = 6 X1 = ( 2 + 6 ) : 2 = 4 X2 = ( - 4 ) : 2 = ( - 2 ) Сумма корней = ( 4 - 2 = 2) Ответ 2