// Solving ax^2 + bx + c = 0
#include <iostream>
#include <math.h>
using namespace std;

double a, b, c; 
double D, x1, x2;

int main()
{
  a = 1.;
  b = 3.;
  c = -4.;

  D = b*b-4.*a*c; // determinant

  if (D>=0){
    // only executed if expression is true
    x1 = (-b + sqrt(D))/(2.*a); // 1st root
    x2 = (-b - sqrt(D))/(2.*a); // 2nd root
    cout << x1 << " " << x2 << endl;
  }
}