To transform the function \( f(x) = x^2 + 9 \) to \( f(2x + 1) \) at \( x = 2 \), we first need to compute \( 2x + 1 \) when \( x = 2 \):
\[ 2(2) + 1 = 4 + 1 = 5 \]
Now, we will evaluate \( f(5) \):
\[ f(5) = 5^2 + 9 = 25 + 9 = 34 \]
Thus, the correct transformation \( f(2x + 1) \) for \( x = 2 \) gives us:
\[ \boxed{34} \]