Д=(-15)^2-4*2*(-77)=841
x1=(15+29)/2*2=44/4=11
x2=(15-29)/4=-14/4
2) D=-3^2-4*1*(-40)=169
x1=3+13/2=8
x2=3-13/2=-5
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Д=(-15)^2-4*2*(-77)=841
x1=(15+29)/2*2=44/4=11
x2=(15-29)/4=-14/4
2) D=-3^2-4*1*(-40)=169
x1=3+13/2=8
x2=3-13/2=-5