It seems like you're trying to compute a limit, but the function for which you want to compute the limit is not clear.

Could you clarify the expression or function that involves $x$ as $x \to 4$? For example, limits typically take the form:

$\lim_{x \to a} f(x)$

Where $f(x)$ is the function and $a$ is the value $x$ approaches (in this case, 4). Feel free to provide more details, and I can assist you further!

Would you like more details or help with specific limits?

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Here are 5 related questions for further exploration:

1. How do you compute $\lim_{x \to 4} \frac{x^2 - 16}{x - 4}$?
2. What is the definition of a limit in calculus?
3. Can you find the one-sided limit $\lim_{x \to 4^-} f(x)$ for some given function $f(x)$?
4. How do you compute limits that result in indeterminate forms like $\frac{0}{0}$?
5. What is the difference between a finite limit and an infinite limit?

Tip: Always check for indeterminate forms when calculating limits, as they often require algebraic manipulation like factoring or rationalizing.