using System;

public class Program

{

    public static double f(double x)

    {

        return Math.Pow(x, 4) + 3*x - 8;

    }

    public static void Main()

    {

        double x1 = 1, x2 = 2;

        double z = 0;

        double error = 0.0001;

        while(Math.Abs(x1-x2) >= error)

        {

            z = (x1+x2)/2;

            if(f(z)*f(x1)<=0)

            {

                x2 = z;

            }

            else

            {

                x1 = z;

            }

        }

        Console.WriteLine("La solución es " + z + " +- " + error + "");

    }

}