по теореме Виета
х1+х2=-7/3
х1*х2=-11/3
2x1x2 +-x1-x2=2x1x2 -(x1+x2)=2*(-11/3)-(-7/3)=-22/3+7/3=-15/3=-5
по теореме Виета
х1+х2=-7/3
х1*х2=-11/3
2x1x2 +-x1-x2=2x1x2 -(x1+x2)=2*(-11/3)-(-7/3)=-22/3+7/3=-15/3=-5