Math Help - Evaluating Functions

1. Evaluating Functions

1) Let f be the function defined by F(x) = 2x^4+5. Find f(2a-h).

So far I've gotten

F(2a-h) = 2(2a-h)^4 + 5
= 2(4a^4 - 8a^3h + 12a^2h^2 - 4ah^3 + h^4) +5

Am I correct so far??

2. $
\left( {2a - h} \right)^2 = \left( {2a} \right)^4 - 4\left( {2a} \right)^3 h + 6\left( {2a} \right)^2 h^2 - 4\left( {2a} \right)h^3 + h^4
$