Quadratic equation.cs

using System;

class Program
{
    static void Main()
    {
        double a, b, c, x1, x2;
        a = double.Parse(Console.ReadLine());
        b = double.Parse(Console.ReadLine());
        c = double.Parse(Console.ReadLine());

        double insideSquareRoot = (b * b) - 4 * a * c;
        double t = (-0.5 * (b + Math.Sign(b) * Math.Sqrt(insideSquareRoot)));

        if (insideSquareRoot < 0)
        {
            Console.WriteLine("no real roots");
        }
        else
        {
            x1 = t / a;
            x2 = c / t;

            if(x1==x2)
            {                
                Console.WriteLine("x1=x2="+ x1);
            }
            else
            {                
                Console.WriteLine("x1="+x1+"; x2="+x2);
            }
            
        }
    }       
}