To reflect the function \( f(x) = (x + 1)^2 \) over the x-axis, we take the negative of the entire function. Therefore, the new function \( g(x) \) can be expressed as:
\[ g(x) = -f(x) = -((x + 1)^2) \]
So, the equation for \( g(x) \) is:
\[ g(x) = -(x + 1)^2 \]
Thus, the correct response from the options provided is:
\[ g(x) = -\left( (x + 1)^2 \right) \]
Or equivalently, in the options given,
g(x) = - (x + 1)^2 (if that option exists in the format mentioned).