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

