int main(int argc, char* argv[])
{
	int n,j;
	scanf("%d",&n);
	for(j=1;j<=n;j++){
		double a,b,c,d,e,x1,x2;
		scanf("%lf%lf%lf",&a,&b,&c);
		d=b*b-4*a*c;
		e=-(b/(2*a));
		if(d>0){
			x1=e+(sqrt(d))/(2*a);
			x2=e-(sqrt(d))/(2*a);
			printf("x1=%.5lf;x2=%.5lf\n",x1,x2);
		}
		if(d==0){
			x1=e;
			printf("x1=x2=%.5lf\n",x1);
		}
		if(d<0){
			d=-d;
			if(b!=0){
			
			printf("x1=%.5lf+%.5lfi;x2=%.5lf-%.5lfi\n",e,(sqrt(d))/(2*a),e,(sqrt(d))/(2*a));
			}
			if(b==0){ 
				
				printf("x1=%.5lf+%.5lfi;x2=%.5lf-%.5lfi\n",b,(sqrt(d))/(2*a),b,(sqrt(d))/(2*a));
			}
		}

	}

	return 0;
}