import static java.lang.Math.*;

public class Polynomial {

    private double a1, b1, c1;
    private double a2, b2, c2;

    private Polynomial(double a1, double b1, double c1) {
        this.a1 = a1;
        this.b1 = b1;
        this.c1 = c1;
    }

    /*private Polynom2(double a2, double b2, double c2) {
        this.a2 = a2;
        this.b2 = b2;
        this.c2 = c2;
    }*/

    private void addPolynom() {
        double a3 = a1 + a2;
        double b3 = b1 + b2;
        double c3 = c1 + c2;

    }


    private void subPolynom() {
        double a3 = a1 - a2;
        double b3 = b1 - b2;
        double c3 = c1 - c2;
    }

    private void nullPolynom(){
        double d = 4 * b1 - a1 * c1;
        double x1 = ((-b1 + sqrt(d)) / 2) * a1;
        double x0 = ((-b1 - sqrt(d)) / 2) * a1;
        System.out.print("x0= "+x0+ "   x1="+x1);

    }
    public String toString(){
        return "f(x1)= " + a1 +"x^2 + "+ b1 +"x + "+ c1;
    }
    public static void main(String[] args) {
        Polynomial polynom = new Polynomial(2.0, -5.0,  9.0);
        Polynomial polynom1 = new Polynomial( -5.0, 8.0, -3.0);
        System.out.println("f(x)=" +polynom.a1+"x^2  "+polynom.b1+"x + "+polynom.c1);
        System.out.print(polynom);
        polynom.addPolynom();
        System.out.println(polynom);
        polynom.subPolynom();
        System.out.println(polynom);
        polynom.nullPolynom();
    }
}