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