title: C# Find Nth Root
body: <p>I use below method to calculate Nth Root of double value, but it takes a lot of time for calculating the 240th root. I found out about Newton method, but was not able to implement it into a method. Any help would be appreciated. </p>
  
  <pre><code>static double NthRoot(double A, int N)
  {
     double epsilon = 0.00001d;//
     double n = N;
     double x = A / n;
     while (Math.Abs(A-Power(x,N)) &gt; epsilon)
     {
      x = (1.0d/n) * ((n-1)*x + (A/(Power(x, N-1))));
     }
     return x;
  }
  </code></pre>