
int main(int argc, char* argv[])
{
	int n,i;
	scanf("%d",&n);
	double a,b,c;
	double x1,x2,shb;
	for(i=0;i<n;i++){
		scanf("%lf%lf%lf",&a,&b,&c);
		if(b*b-4*a*c<0){
			if(b==0){shb=0.00000;}
			else {shb=(-b)/(2*a);}
		 	x1=sqrt(4*a*c-b*b)/(2*a);
            x2=-sqrt(4*a*c-b*b)/(2*a);
 		    printf("x1=%.5f+%.5fi;x2=%.5f%.5fi\n",shb,x1,shb,x2);
		}
		else{
			x1=(-b+sqrt(b*b-4*a*c))/(2*a);
            x2=(-b-sqrt(b*b-4*a*c))/(2*a);
			if(x1==x2)printf("x1=x2=%.5f\n",x1);
		    else printf("x1=%.5f;x2=%.5f\n",x1,x2);
		}

	}
 	return 0;
}
