Root of number - newton method

Newton_Method_RootOfNumber.cs

  private static double newtonMethod(int n, double target, double delta) {
    double root = 1;
    
    do {
      double fx = fx(root, n, target);
      double df = df(root, n);
      root = root - fx/df;    
    } while (Math.abs(fx(root, n, target)) > delta);
    return root;
  }
  
  private static double fx(double root, int n, double target) {
    return Math.pow(root, n) - target;
  }
  
  private static double df(double root, int n) {
    return n * Math.pow(root, n - 1);
  }