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