public Polynom addiere(Polynom p) {
        double[] addpoly = p.poly;

        if (addpoly.length > poly.length) {

            double[] newpoly = new double[addpoly.length];
            for (int i = 0; i < newpoly.length; i++) {
                if (i < poly.length)
                    newpoly[i] = addpoly[i] + poly[i];
                else
                    newpoly[i] = addpoly[i];
            }
            poly = newpoly;

        } else {
            for (int i = 0; i < addpoly.length; i++)
                poly[i] += addpoly[i];

        }
        return this;

    }