(4.9+3.5x)(7x-2.8)=0
(4.9 +3.5х)(7х -2.8)=0 4.9+3.5х=7х-2.8 3.5х-7х=-4.9-2.8 3.5х=7.7 х=7.7:3.5 х=2.2
34.3x+24.5x^-13.72-9.8x=0 24.5x^+24.5x-13.72=0 D=600.25+1344.56=1944.81 x1= __-24.5 + 44.1__=0.4 49 x2=__-24.5-44.1__=-1.4 49