Find The Quadratic Equation From The Values In C#

using System;
class Quadtest {
    public static void Main() {
        double a, b, c;
        double disc, deno, x1, x2;
        Console.WriteLine("ENTER THE VALUES OF A,B,C...");
        a = Convert.ToDouble(Console.ReadLine());
        b = Convert.ToDouble(Console.ReadLine());
        c = Convert.ToDouble(Console.ReadLine());
        if (a == 0) {
            x1 = -c / b;
            Console.WriteLine("The roots are Linear:", x1);
        } else {
            disc = (b * b) - (4 * a * c);
            deno = 2 * a;
            if (disc > 0) {
                Console.WriteLine("THE ROOTS ARE REAL AND DISTINCT ROOTS");
                x1 = (-b / deno) + (Math.Sqrt(disc) / deno);
                x2 = (-b / deno) - (Math.Sqrt(disc) / deno);
                Console.WriteLine("THE ROOTS ARE... " + x1 + " and " + x2);
            } else if (disc == 0) {
                Console.WriteLine("THE ROOTS ARE REPEATED ROOTS");
                x1 = -b / deno;
                Console.WriteLine("THE ROOT IS...: " + x1);
            } else {
                Console.WriteLine("THE ROOTS ARE IMAGINARY ROOTS\n");
                x1 = -b / deno;
                x2 = ((Math.Sqrt((4 * a * c) - (b * b))) / deno);
                Console.WriteLine("THE ROOT 1: " + x1 + "+i" + x2);
                Console.WriteLine("THE ROOT 2:" + x1 + "-i" + x2);
            }
        }
        Console.ReadLine();
    }
}