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$r+s=9,rs=3,r^{2}+s^{2}=-b$<=>$(r+s)^{2}-2rs=-b$<=>$b=-75,c=9$
$r+s=9,rs=3,r^{2}+s^{2}=-b$
ΑπάντησηΔιαγραφή<=>$(r+s)^{2}-2rs=-b$
<=>$b=-75,c=9$