/******************************************************************************

* Compilation: javac Quadratic.java

* Execution: java Quadatic b c

*

* ½â¶þ´Î·½³Ìʽ

* Given b and c, solves for the roots of x*x + b*x + c.

* Assumes both roots are real valued.

*

* x1 = (-b + (b*b - 4ac)^(-2)) / 2a

* x2 = (-b - (b*b - 4ac)^(-2)) / 2a

*

*

* % java Quadratic -3.0 2.0

* 2.0

* 1.0

*

* % java Quadratic -1.0 -1.0

* 1.618033988749895

* -0.6180339887498949

*

* Remark: 1.6180339... is the golden ratio.

*

* % java Quadratic 1.0 1.0

* NaN

* NaN

*

*

******************************************************************************/

public class Quadratic {

public static void main(String[] args) {

double b = Double.parseDouble(args[0]);

double c = Double.parseDouble(args[1]);

double discriminant = b * b - 4.0 * c;

double sqroot = Math.sqrt(discriminant);

double root1 = (-b + sqroot) / 2.0;

double root2 = (-b - sqroot) / 2.0;

System.out.println(root1);

System.out.println(root2);

}

}