Răspuns :
x² +2x+x+2=56
x²+3x+2=56
x²+3x-54=0
a=1, b=3, c=-54
Δ=b²-4ac=9-4*1*-54=216+9=225
Δ>0⇒x1=-b-√Δ/2a=-3--15/2=-9
x2=-b+√Δ/2a=-3+15/2=6
S=6, -9
x²+3x+2=56
x²+3x-54=0
a=1, b=3, c=-54
Δ=b²-4ac=9-4*1*-54=216+9=225
Δ>0⇒x1=-b-√Δ/2a=-3--15/2=-9
x2=-b+√Δ/2a=-3+15/2=6
S=6, -9