How to make calculate quadratic formula in c#

How to make calculate quadratic formula in c#

Write a program which takes two variables a, b and constant c as input from the user to calculate roots using quadratic formula. It must include two functions to return the calculated roots. 

    class program1
        Public static double root(double a, double b, double c)

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

           return re;


    class Program
        static void Main(string[] args)

            double a, b, c;
            double res = 0;
            Console.WriteLine("Enter a value");
            a = double.Parse(Console.ReadLine());
            Console.WriteLine("Enter B value");
            b = double.Parse(Console.ReadLine());
            Console.WriteLine("Enter c Value");
            c = double.Parse(Console.ReadLine());

            res = pogram.root(a, b, c);
            Console.WriteLine("Quadratic Answer is ::" + res);

Screen Shot

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