1. The problem asks to write the left-hand side (LHS) of an inequality evaluated at a specific point $x_0$. 2. Generally, an inequality can be written as $f(x) \leq g(x)$ or $f(x) \geq g(x)$, where $f(x)$ and $g(x)$ are functions. 3. The left-hand side of the inequality is the function $f(x)$. 4. To write the LHS at $x_0$, substitute $x$ with $x_0$ in $f(x)$, resulting in $f(x_0)$. 5. This means the left-hand side at $x_0$ is simply the value of the function $f$ evaluated at $x_0$. 6. Without a specific function given, the answer is $f(x_0)$, representing the LHS of the inequality at $x_0$. Therefore, the left-hand side of the inequality at $x_0$ is $f(x_0)$.