3x^2-8x-15=0
x1=(8+кор.кв.(64+180))/6=(8+кор.кв.(244))/6=(8+2кор.кв.61)/6 =3.93675
x2=(8-кор.кв.(64+180))/6=(8-кор.кв.(244))/6=(8-2кор.кв.61)/6 =-1.27008
(8+2кор.кв.61)/6 (8-2кор.кв.61)/6 ((8+2кор.кв.61)/6)^2 + ((8-2кор.кв.61)/6)^2
_______________ + _______________ = ______________________________________ =
(8-2кор.кв.61)/6 (8+2кор.кв.61)/6 ((8-2кор.кв.61)/6)*((8+2кор.кв.61)/6)
=-3.4
-1 -0.6 -0.2 0.2 0.6 1 1.4 1.8 2.2 2.6 3