public static void Main()
double a = Double.Parse(Console.ReadLine());
double b = Double.Parse(Console.ReadLine());
double c = Double.Parse(Console.ReadLine());
double d = b * b - (4 * a * c) ;
double x = (b * -1) + Math.Sqrt(d) / (2 * a);
double y = (b * -1) - Math.Sqrt(d) / (2 * a);
Console.Write("x1 i x2 sa ravni na: ");
Console.WriteLine(x + " " + y);