public class Quadratic {
    public static double root1(double a, double b, double c) {
        double determinant = determinant(a, b, c);
        return (-b + Math.sqrt(determinant)) / (2*a);
    }
    public static double root2(int a, int b, int c) {
        double determinant = determinant(a, b, c);
        return (-b - Math.sqrt(determinant)) / (2*a);
    }
    private static double determinant(double a, double b, double c) {
        return b*b - 4*a*c;
    }
}