1. **Problem Statement:** Given functions $f(x) = x + 2$ and $g(x) = \frac{1}{x-9}$, find and analyze the composite function $h(x) = f(g(x))$.
2. **Find the equation of $h(x)$:**
By definition, $h(x) = f(g(x)) = f\left(\frac{1}{x-9}\right)$. Since $f(x) = x + 2$, substitute $g(x)$ into $f$:
$$h(x) = \frac{1}{x-9} + 2$$
3. **Simplify $h(x)$:**
Write $2$ as $\frac{2(x-9)}{x-9}$ to combine terms:
$$h(x) = \frac{1}{x-9} + \frac{2(x-9)}{x-9} = \frac{1 + 2(x-9)}{x-9}$$
Simplify numerator:
$$1 + 2(x-9) = 1 + 2x - 18 = 2x - 17$$
So,
$$h(x) = \frac{2x - 17}{x - 9}$$
4. **Domain of $h(x)$:**
The domain excludes values making denominator zero:
$$x - 9 \neq 0 \implies x \neq 9$$
So, domain is all real numbers except $9$.
5. **Range of $h(x)$:**
Set $y = \frac{2x - 17}{x - 9}$ and solve for $x$:
$$y(x - 9) = 2x - 17$$
$$yx - 9y = 2x - 17$$
Group $x$ terms:
$$yx - 2x = 9y - 17$$
$$x(y - 2) = 9y - 17$$
$$x = \frac{9y - 17}{y - 2}$$
For $x$ to be defined, denominator $y - 2 \neq 0$, so $y \neq 2$.
Thus, range is all real numbers except $2$.
6. **Intercepts:**
- **x-intercept:** Set $h(x) = 0$:
$$\frac{2x - 17}{x - 9} = 0 \implies 2x - 17 = 0 \implies x = \frac{17}{2} = 8.5$$
- **y-intercept:** Set $x=0$:
$$h(0) = \frac{2(0) - 17}{0 - 9} = \frac{-17}{-9} = \frac{17}{9} \approx 1.89$$
7. **Summary:**
$$h(x) = \frac{2x - 17}{x - 9}$$
Domain: $x \neq 9$
Range: $y \neq 2$
x-intercept: $(8.5, 0)$
y-intercept: $(0, \frac{17}{9})$
8. **Graph features:**
- Vertical asymptote at $x=9$
- Horizontal asymptote at $y=2$
- Intercepts as above
This rational function has a hyperbola shape with these asymptotes and intercepts.
Composite Function 6551D0
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