To reflect the function \( f(x) = (x + 1)^2 \) over the x-axis, we need to take the negative of the entire function. Therefore, the equation for \( g(x) \) will be:
\[ g(x) = -((x + 1)^2) \]
This corresponds to:
\[ g(x) = -(x + 1)^2 \]
So the correct answer is:
g(x) = −(x + 1)².