title: quadratic formula with scanner inputs
body: <p>Okay so I am a complete Java noob, and I'm trying to create a program for class that runs a quadratic equation using scanner inputs. So far what I've got is this:</p>
  
  <pre><code>import java.util.*;
  
  public class QuadraticFormulaSCN {
  
  
  public static void main(String[]args) {
    System.out.println("insert value for a:");
    Scanner scan1 = new Scanner(System.in);
     double a = scan1.nextDouble();
      System.out.println("insert value for b:");
    Scanner scan2 = new Scanner(System.in);
      double b = scan2.nextDouble();
      System.out.println("insert value for C:");
    Scanner scan3 = new Scanner(System.in);
     double c = scan3.nextDouble();
  
      double answer =((Math.sqrt(Math.pow(b,2)-(4*a*c))-b)/2);
        double final2 =(-b + Math.sqrt(Math.pow(b,2)-(4*a*c)))/2;
    System.out.println("The x values are:" + answer + final2);
  }
  }
  </code></pre>
  
  <p>But I get a weird output, specifically <code>NaNaN</code>... What do I do to fix this? What am I doing wrong?</p>