int main(int argc, char* argv[])
{
	int i,j;
	double a,b,c;
    double m,n,x1,x2,d;
	    scanf("%d",&j);
    for(i=0;i<j;i++){
		scanf("%lf %lf %lf",&a,&b,&c);
		d=b*b-4*a*c;

	    if (d==0){
			m=-b/(2*a);
		    n=sqrt(d);
			x1=x2=m;
            printf("x1=x2=%.5lf\n",m);
		}
		else if (d>0){
			m=-b/(2*a);
		    n=sqrt(d)/(2*a);
			x1=m+n;
		    x2=m-n;
	        printf("x1=%.5lf;x2=%.5lf\n",x1,x2);
		}
		else{
	     	m=-b/(2*a);
		    n=sqrt(-b*b+4*a*c)/(2*a);
			printf("x1=%.5lf+%.5lfi;",m,n);
			printf("x2=%.5lf-%.5lfi\n",m,n);
		}

   }
	return 0;
}

