import java.lang.Math;

public class MyClass {
    public static void main(String args[]) {
	  // Forma directa
      System.out.println("x1 " +  (-(-1)+Math.sqrt((-1)*(-1)-4*1*(-12)))/(2*1) );
      System.out.println("x2 " +  (-(-1)-Math.sqrt((-1)*(-1)-4*1*(-12)))/(2*1) );
      
      
      
      // Usando variables
      double a = 1.0;
      double b = 4.0;
      double c = 1.0 ;   
      System.out.println("x1 " +  (-b+Math.sqrt(b*b-4.0*a*c))/(2.0*a) );
      System.out.println("x2 " +  (-b-Math.sqrt(b*b-4.0*a*c))/(2.0*a) );
    }
}