Найдите корень уравнения (4,9+3,5х)×(7х-2,8)=0

34.3х+24,5х²-13,72-9,8х=0
24,5х²-24,5х-13,72=0
D = 24.5²-4*24.5*(-13.72)=600.25+1344.56=1944.81

x₁=(24.5+44.1)/2*24.5 = 68.6/49

x₂=(24.5-44.1)/49= -19.6/49

34,3х-13,72+24,5х^2-9.8x=0
24.5x^2+24.5x-13.72=0
D= 600,25- 4*24,5*(-13,72)=√1944,81=44,1
х1 = (-24,5+44,1)/2*24,5=0,4
х2 = (-24,5-44,1)/2*24,5= 1,4