C# Newton Method

Implementation of Newton Method written in C#.

IN
-3
0.0000001
OUT
X: -3 f(x): 2
X: -2.5 f(x): 0.25
X: -2.41666666666667 f(x): 0.00694444444444398
X: -2.41421568627451 f(x): 6.0730488242718E-06

using System;

namespace NewtonMethodCS
{
    class Program
    {
        static void Main(string[] args)
        {
            double x;
            double prevX;
            double precision;

            Console.Write("Enter initial guess: ");
            x = Convert.ToDouble(Console.ReadLine());

            prevX = x;

            Console.Write("Enter precision of method: ");
            precision = Convert.ToDouble(Console.ReadLine());

            while (Math.Abs(Function(x)) > precision)
            {
                Console.WriteLine("X: " + x + " f(x): " + Function(x));

                x = prevX - (Function(prevX) / FunctionDerivative(prevX));
                prevX = x;
            }

            Console.ReadKey(); //Wait
        }

        static double Function(double x) //x^2 + 2x -1
        {
            return x * (x + 2) - 1;
        }

        static double FunctionDerivative(double x) 
        {
            return 2 * x + 2;
        }
    }
}