whats (2+h)^3
(2 + h)
----------
2h + h^2
4 + 2h
-----------------
4 + 4h + h^2
-------------------
4h + 4h^2 + h^3
8+ 8h + 2h^2
------------------------------------
8 + 12h + 6h^2 + h^3 = h^3 + 6h^2 + 12h + 8 [ in order of descending powers]