c#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1 {
    public delegate double delDoubleDouble(double a);
    class Program {

        static void Main(string[] args) {
            Console.WriteLine(metodoNewton(1, 0.001, function, derivada));
            double a = 1, b = 0;
            int i;
            for (i = 0; i < 10; i++) {
                a = metodoNewton(a, 0.001, function, derivada);
                Console.WriteLine(a);

            }

            Console.WriteLine();
            Console.WriteLine(a);
            Console.ReadKey();
        }

        static double function(double x) {
            return x * x  -4;
        }
        static double derivada(double x) {
            return 2 * x ;
        }

        static double metodoNewton(double ponto, double erro, delDoubleDouble funct, delDoubleDouble derivada) {
            return ponto - (funct(ponto) / derivada(ponto));

        }
        static double secant(double x2, delDoubleDouble fx) {
            double x0 = 0d, x1 = 0d;
            for (int i = 0; i < 1000; i++) {
                x2 = x1 - (x1 - x0) / (fx(x1) - fx(x0));
            }
            return 0;
        }

    }
}