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