using System;

public class Program

{

    public static void Main()

    {   

        Console.WriteLine("Enter a");

        double a = double.Parse(Console.ReadLine()) ;

        Console.WriteLine("Enter b");

        double b = double.Parse(Console.ReadLine()) ;

        Console.WriteLine("Enter c");

        double c = double.Parse(Console.ReadLine()) ;

    double x1=((b* (Math.Sqrt(b*b-4*a*c)/2*a)));

        Console.WriteLine("x1=" x1);

             double x2= ((b* -(Math.Sqrt(b*b-4*a*c)/2*a)));

                Console.WriteLine("x2=" x2);

    }

}

​