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

