using System;

public class Program

{

    public static double func(double x)

        {

            return 2 * Math.Pow(x, 4) - Math.Pow(x, 2) - 10;

        }

    public static void Main()

        {

            double a = 0, b = 5;

            double eps = 0.01;

​

            Console.WriteLine("x = " + Hord(a, b, eps));

        }

    static double Hord(double a, double b, double eps)

    {

        double tmp, c = 0;

            do

            {

                tmp = c;

                c = a - func(a) * ((b - a) / (func(b) - func(a)));

                if (func(a) * func(c) < 0)

                    b = c;

                else

                    a = c;

            } while (Math.Abs(func(tmp) - func(c)) > eps && func(c) != 0);

            return c;

    }

}