expand as a binomial series (p^2 + 3h)^4
coefficients from Pascal's triangle: 1 4 6 4 1
(p^2)^4 + 4(p^2)^3 (3h) + 6(p^2)^2 (3h)^2 + 4(p^2) (3h)^3 + (3h)^4
p^8 + 12p^6h + 54p^4h^2 + 108p^2h^3 + 81h^4
(p^2)^4 + 4(p^2)^3 (3h) + 6(p^2)^2 (3h)^2 + 4(p^2) (3h)^3 + (3h)^4
p^8 + 12p^6h + 54p^4h^2 + 108p^2h^3 + 81h^4