class NR {

  NewtonRaphson eqn;

  final static double EPSILON = 1e-10;

  public NR(NewtonRaphson eqn) {
    this.eqn = eqn;
  } // End NR()

  double solve(double start) {

    double x = start;
    while(Math.abs(eqn.f(x)) >= EPSILON) {
      x = x - eqn.f(x)/eqn.fdash(x);
    }

    return x;
  } // End solve()

} // End class NR