int main()
{
 int n,i;
 double a,b,c,dt,p,q;
 scanf("%d",&n);
 for(i=1;i<=n;i++)
 {
  scanf("%lf%lf%lf",&a,&b,&c);
  dt=b*b-4*a*c;
  if(dt==0)
  {
   p=-b/2/a;if(p==0)p=0;
   printf("x1=x2=%.5lf\n",p);
  }
  else if(dt>0)
  {
   p=(-b+sqrt(dt))/2/a;q=(-b-sqrt(dt))/2/a;
   printf("x1=%.5lf;x2=%.5lf\n",p,q);
  }
  else
  {
   p=-b/2/a;q=sqrt(-dt)/2/a;if(p==0)p=0;
   printf("x1=%.5lf+%.5lfi;x2=%.5lf-%.5lfi\n",p,q,p,q);
  }
 }
 return 0;
}

