1. **State the problem:** We need to find and graph all vertical and horizontal asymptotes of the rational function $$f(x) = \frac{-7x + 1}{2x^2 - 6x - 8}$$.
2. **Find vertical asymptotes:** Vertical asymptotes occur where the denominator is zero and the numerator is not zero.
Set denominator equal to zero:
$$2x^2 - 6x - 8 = 0$$
3. **Solve the quadratic equation:**
Use the quadratic formula $$x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$$ where $a=2$, $b=-6$, $c=-8$.
Calculate discriminant:
$$b^2 - 4ac = (-6)^2 - 4 \times 2 \times (-8) = 36 + 64 = 100$$
Calculate roots:
$$x = \frac{-(-6) \pm \sqrt{100}}{2 \times 2} = \frac{6 \pm 10}{4}$$
So,
$$x_1 = \frac{6 + 10}{4} = \frac{16}{4} = 4$$
$$x_2 = \frac{6 - 10}{4} = \frac{-4}{4} = -1$$
4. **Check numerator at these points:**
$$-7(4) + 1 = -28 + 1 = -27 \neq 0$$
$$-7(-1) + 1 = 7 + 1 = 8 \neq 0$$
Since numerator is not zero at $x=4$ and $x=-1$, vertical asymptotes are at:
$$x=4 \quad \text{and} \quad x=-1$$
5. **Find horizontal asymptotes:** Compare degrees of numerator and denominator.
Degree numerator = 1, degree denominator = 2.
Since degree denominator > degree numerator, horizontal asymptote is:
$$y=0$$
6. **Summary:**
- Vertical asymptotes at $x=-1$ and $x=4$.
- Horizontal asymptote at $y=0$.
These lines can be graphed as dashed lines to indicate asymptotes.
Asymptotes Rational 151Afd
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