1. **Problem stated:** Find the complex roots of $f(x)=-\frac{1}{x-2}-\ln(x-4)$ and its asymptotes.
2. **Formula and domain rules:** A root is found by solving $f(x)=0$.
For logarithms, the input must be positive, so $x-4>0$, which means $x>4$.
Also, the denominator cannot be zero, so $x\neq 2$.
The domain is therefore $x>4$.
3. **Set the function equal to zero:**
$$-\frac{1}{x-2}-\ln(x-4)=0$$
4. **Move one term to the other side:**
$$-\frac{1}{x-2}=\ln(x-4)$$
Since the left side is negative for $x>4$, we already know any root must satisfy $\ln(x-4)<0$, so $00$.
6. **Check whether there is an elementary closed-form solution:** This equation mixes a rational function and a logarithm, so it cannot be solved by ordinary algebraic steps.
The root must be found numerically.
7. **Numerical solution:** Solving
$$-\frac{1}{x-2}-\ln(x-4)=0$$
on the domain $x>4$ gives approximately
$$x\approx 4.3669$$
So the real root is approximately $4.3669$.
Since the function is only defined for real $x>4$, there are no other real roots from the given expression.
8. **Asymptotes:**
The logarithm term has a vertical asymptote where its input approaches $0^+$.
That happens at
$$x=4$$
So $x=4$ is a vertical asymptote.
9. **Check for other asymptotes:** As $x\to\infty$,
$$-\frac{1}{x-2}\to 0$$
and
$$\ln(x-4)\to\infty$$
so
$$f(x)\to-\infty$$
This means there is no horizontal asymptote and no slant asymptote.
10. **Final answer:** The function has one real root at approximately $x\approx 4.3669$.
Its only asymptote is the vertical asymptote $x=4$.
There are no horizontal or slant asymptotes.
Roots Asymptotes Ebe0Ad
Step-by-step solutions with LaTeX - clean, fast, and student-friendly.