To reflect the function \( f(x) = (x + 1)^2 \) over the x-axis, we need to negate the entire function. Therefore, the equation for \( g(x) \) becomes:
\[ g(x) = -f(x) = -((x + 1)^2) \]
So, the correct answer is:
\[ g(x) = -(x + 1)^2 \]
Thus, the response that matches is:
g(x) = −(x+1)²