int main()
{
 int n,i;
 scanf("%d",&n);
double a,b,c,d,e;
 for(i=0;i<n;i++)
 {
 scanf("%lf%lf%lf",&a,&b,&c);
 d=b*b-4*a*c;
 if(b==0)
	 e=0;
 else e=(-b)/(2*a);
if(d>0)
  printf("x1=%.5lf;x2=%.5lf\n",e+sqrt(d)/(2*a),e-sqrt(d)/(2*a));
else if(d<0)
  printf("x1=%.5lf+%.5lfi;x2=%.5lf%.5lfi\n",e,sqrt(-d)/(2*a),e,-sqrt(-d)/(2*a));
  else printf("x1=x2=%.5lf\n",e);
 }
return 0;	  
}