import java.util.Scanner;
import java.text.DecimalFormat;

class quad {
        public static void main (String[] args) {

            	Scanner user_input = new Scanner(System.in);

                Double a = getDouble(user_input, "Coefficient of x^2: ");
                Double b = getDouble(user_input, "Coefficient of x: ");
                Double c = getDouble(user_input, "Constant: ");

                user_input.close();		// We are done with the scanner now.

                Double x1 = (-b + Math.sqrt(b*b-4*a*c))/(2*a);
                Double x2 = (-b - Math.sqrt(b*b-4*a*c))/(2*a);

                DecimalFormat fmt = new DecimalFormat("+ #.#####;- #.#####");

                if (Double.isNaN(x1)) {
                        original(a, b, c);
                        System.out.println(" does not cross the x axis");
                        System.out.println("There are no real values for x");
                } else if (x1.equals(x2)) {
                        original(a, b, c);
                        System.out.println(" = (x " + fmt.format(-x1) + ")^2");
                        System.out.println("X is " + x1);
                } else {
                        original(a, b, c);
                        System.out.println(" = (x " + fmt.format(-x1) + ")(x " + fmt.format(-x2) + ")");
                        System.out.println("X can be " + x1 + " or " + x2);
                }
        }

        public static double getDouble (Scanner scanner, String prompt) {
                double input = 777.7; //value will be parsed again
                boolean errorAlert = false;
                while(!errorAlert) {
                        errorAlert = true;
                        try {
                                System.out.print(prompt);
                                input = Double.parseDouble(scanner.next());
                        } catch (NumberFormatException e) {
                                System.out.println("Input must be a decimal number.");
                                errorAlert = false;
                        }
                }
                return input;
        }

        public static void original (double a, double b, double c) {
                System.out.print(a + "x^2 + " + b + "x + " + c);
        }
}