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