int main()
{
    int n,i;
    float a,b,c,d,t;
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
    scanf("%f%f%f",&a,&b,&c); 
    d=b*b-4*a*c;
    if(d>0)
    {
           
           printf("x1=%.5f;x2=%.5f\n",(-b+sqrt(d))/(2*a)+1e-6,(-b-sqrt(d))/(2*a)+1e-6);
    }
    else if(d<1e-6&&d>-1e-6)
    {
                   printf("x1=x2=%.5f\n",(-b)/(2*a));
    }
    else
    {
        t=-b/(2*a)+1e-8;
        printf("x1=%.5f%+.5fi;x2=%.5f%+.5fi\n",t,sqrt(-d)/(2*a),t,-sqrt(-d)/(2*a));
        
    }
    }

    //getch();
    return 0;
}
