#include <stdlib.h>
#include <stdio.h>
#include <math.h>

double root_1(double a, double b, double c)
{
  return (-b + sqrt(b*b-4*a*c))/(2*a);
}

double P2(double x, double a, double b, double c)
{
  return (a*x*x + b*x + c);
}

int main(void)
{
  double a,b,c,x;
  do {
    printf("Anna 2. asteen yht„l”n a b c >");
    scanf("%lf %lf %lf",&a,&b,&c);
    x = root_1(a,b,c);
    printf("1. ratkaisu on %lf.  "
           "Arvoksi tulee t„ll”in %lf.\n",x,P2(x,a,b,c));
  } while (a>0);
  return 0;
}