public static BinomMember addMembers(BinomMember bn1, BinomMember bn2) {
		if (bn1.isSame(bn2)) {
			return new BinomMember(bn1.getCons() + bn2.getCons(),
					bn1.getxDeg(), bn1.getyDeg());
		} else {
			return null;
		}
	}