Rational Function D40690
1. **State the problem:** We need to analyze the rational function $$R(x) = \frac{x+6}{x(x+12)}$$ to determine where its graph is above or below the x-axis and identify the correct graph.
2. **Find the domain:** The denominator is zero at $$x=0$$ and $$x=-12$$, so these are vertical asymptotes. The domain is $$(-\infty,-12) \cup (-12,0) \cup (0,\infty)$$.
3. **Find zeros of the numerator:** Set numerator equal to zero:
$$x+6=0 \implies x=-6$$.
This is the x-intercept.
4. **Determine sign of $$R(x)$$ on intervals:**
- For $$x < -12$$: Choose $$x=-13$$.
Numerator: $$-13+6=-7$$ (negative).
Denominator: $$-13(-13+12) = -13(-1) = 13$$ (positive).
So $$R(x)$$ is negative (negative/positive = negative).
- For $$-12 < x < 0$$: Choose $$x=-1$$.
Numerator: $$-1+6=5$$ (positive).
Denominator: $$-1(-1+12) = -1(11) = -11$$ (negative).
So $$R(x)$$ is negative (positive/negative = negative).
- For $$x > 0$$: Choose $$x=1$$.
Numerator: $$1+6=7$$ (positive).
Denominator: $$1(1+12) = 1(13) = 13$$ (positive).
So $$R(x)$$ is positive (positive/positive = positive).
5. **Summary of sign:**
- Below x-axis on $$(-\infty,-12) \cup (-12,0)$$.
- Above x-axis on $$(0,\infty)$$.
6. **Choose the correct graph:**
- The graph has vertical asymptotes at $$x=0$$ and $$x=-12$$.
- The function is below the x-axis on intervals $$(-\infty,-12)$$ and $$(-12,0)$$.
- The function is above the x-axis on $$(0,\infty)$$.
This matches **Graph A** description: asymptotes at $$x=0$$ and $$x=-12$$, curve below x-axis on the left, approaching zero from below on the right.
**Final answers:**
- B. Below x-axis on $$(-\infty,-12) \cup (-12,0)$$.
- C. Above x-axis on $$(0,\infty)$$.
- Correct graph: A.