D=69X1=(-3-sqrt69)/2 Х2=(-3+sqrt69)/2= ((-3-sqrt69)/2)^2+((-3+sqrt69)/2)^2=(9-6sqrt69+69+9+6sqrt69+69)/4=156/4=39
D=69
X1=(-3-sqrt69)/2 Х2=(-3+sqrt69)/2=
((-3-sqrt69)/2)^2+((-3+sqrt69)/2)^2=
(9-6sqrt69+69+9+6sqrt69+69)/4=
156/4=39