void main()
{
    int i=0,n;
    double a,b,c;
    scanf("%d",&n);
    while(i<n)
    {
        scanf("%lf%lf%lf",&a,&b,&c);
        if(b*b-4*a*c>0)
        {
            printf("x1=%.5f;x2=%.5f",(-b+sqrt(b*b-4*a*c))/(2*a),(-b-sqrt(b*b-4*a*c))/(2*a) );
        }
        else if(b*b-4*a*c<1e-7&&b*b-4*a*c>-1e-7)
        {
            printf("x1=x2=%.5f",-b/(2*a));
        }
        else if(b/(2*a)<1e-7&&b/(2*a)>-1e-7)
            printf("x1=%.5f+%.5fi;x2=%.5f-%.5fi",0.0,(1/(2*a))*sqrt(4*a*c-b*b),0.0,(1/(2*a))*sqrt(4*a*c-b*b));
        else
            printf("x1=%.5f+%.5fi;x2=%.5f-%.5fi",-b/(2*a),(1/(2*a))*sqrt(4*a*c-b*b),-b/(2*a),(1/(2*a))*sqrt(4*a*c-b*b));
        i++;
        printf("\n");
    }
}