1. **State the problem:** We are given the rational function $$f(x) = \frac{5}{x+2} - 2$$ and a table of $x$ values: 0.5, 3, 48, 998, 4998. We need to find the corresponding $f(x)$ values and identify the asymptote.
2. **Formula and rules:** The function is a rational function with a vertical asymptote where the denominator is zero, i.e., at $x+2=0 \Rightarrow x=-2$. The horizontal asymptote is the value that $f(x)$ approaches as $x \to \pm \infty$.
3. **Calculate $f(x)$ for each $x$:**
- For $x=0.5$:
$$f(0.5) = \frac{5}{0.5+2} - 2 = \frac{5}{2.5} - 2 = 2 - 2 = 0$$
- For $x=3$:
$$f(3) = \frac{5}{3+2} - 2 = \frac{5}{5} - 2 = 1 - 2 = -1$$
- For $x=48$:
$$f(48) = \frac{5}{48+2} - 2 = \frac{5}{50} - 2 = 0.1 - 2 = -1.9$$
- For $x=998$:
$$f(998) = \frac{5}{998+2} - 2 = \frac{5}{1000} - 2 = 0.005 - 2 = -1.995$$
- For $x=4998$:
$$f(4998) = \frac{5}{4998+2} - 2 = \frac{5}{5000} - 2 = 0.001 - 2 = -1.999$$
4. **Identify the asymptote:**
- Vertical asymptote at $x = -2$ because the denominator is zero there.
- Horizontal asymptote is $y = -2$ because as $x \to \infty$, $\frac{5}{x+2} \to 0$ and $f(x) \to -2$.
5. **Summary:**
- Table of values:
| $x$ | 0.5 | 3 | 48 | 998 | 4998 |
|---|---|---|---|---|---|
| $f(x)$ | 0 | -1 | -1.9 | -1.995 | -1.999 |
- Asymptotes:
- Vertical: $x = -2$
- Horizontal: $y = -2$
The function approaches $y = -2$ as $x$ becomes very large.
Rational Function 430Dda
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