Question 91
Find all functions $f : \mathbb{R} \to \mathbb{R}$ such that
$$
f(x^2 + y) \ge \left(\frac{1}{x} + 1\right) f(y)
$$
holds for all $x \in \mathbb{R} \setminus \{0\}$ and all $y \in \mathbb{R}$.
$$
f(x^2 + y) \ge \left(\frac{1}{x} + 1\right) f(y)
$$
holds for all $x \in \mathbb{R} \setminus \{0\}$ and all $y \in \mathbb{R}$.