title: Code for quadratic equation gives incorrect answer
body: <p>Hello I'm a Beginner in C#. I have made this code for quadratic equation. It runs but does not give the right answer.</p>
  
  <pre><code>using System;
  using System.Diagnostics;
  
  
  namespace mynamespace
  {
      class myclass
      {
          static void Main(string[] args)
          {
              float a, b, c, x1, x2;
              Console.Write("Enter Value in a");
                  a=Convert.ToSingle(Console.ReadLine());
              Console.WriteLine("Enter Value in b");
                  b=Convert.ToSingle(Console.ReadLine());
              Console.WriteLine("Enter Value in c");
                  c=Convert.ToSingle(Console.ReadLine());
  
              x1=(-b + Math.Sqrt ( b*b - 4*a*c)/(2*a));
              x2=(-b - Math.Sqrt ( b*b - 4*a*c)/(2*a));
              Console.WriteLine(x1);
              Console.WriteLine(x2);
              Console.ReadKey();
  
                      }
      }
  }
  </code></pre>