using System;

​

public class Program

{

    public static void Main()

    {

        double x1, x2;

        double solutions = SolveSquare(1, 3, 1, out x1, out x2);

        Console.WriteLine($"Number of Solutions: {solutions}: x1={x1}, x2={x2}");

        solutions = SolveSquare(1, 2, 3, out x1, out x2);

        Console.WriteLine($"Number of Solutions: {solutions}: x1={x1}, x2={x2}");

        solutions = SolveSquare(1, 0, 0, out x1, out x2);

        Console.WriteLine($"Number of Solutions: {solutions}: x1={x1}, x2={x2}");

        solutions = SolveSquare(1, 2, -3, out x1, out x2);

        Console.WriteLine($"Number of Solutions: {solutions}: x1={x1}, x2={x2}");

    }

    public static double SolveSquare(double a, double b, double c, out double x1, out double x2)

    {

        double delta = (b * b) - (4 * a * c);

        if (delta < 0)

        {

            x1 = double.NaN;

            x2 = double.NaN;

            return 0;

        }

​

        double squareDelta = Math.Sqrt(delta);

        x1 = (-b + squareDelta) / (2 * a);

        x2 = (-b - squareDelta) / (2 * a);

        return (delta == 0) ? 1 : 2;

    }

}