D=13^2-4*3*(-10) =169+120=√289=17
x1=(-13+17):6=4:6=0,6
x2=(-13-17):6=-30:6=-5
ответ:-5
x1 = -5
D = 169+120 = 289
x1 = (-13-17)/6 = -5
x2 = (-13+17)/6 = 2/3
