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