1. **Stating the problem:** We need to graph the function $$f(x) = \frac{x^2 + x - 2}{2x^2 - 2x - 3}$$ and analyze its key features.
2. **Formula and rules:** This is a rational function where the numerator and denominator are polynomials. Important rules:
- The function is undefined where the denominator is zero.
- Vertical asymptotes occur at values of $x$ that make the denominator zero but not the numerator.
- Horizontal or oblique asymptotes depend on the degrees of numerator and denominator.
3. **Factor numerator and denominator:**
$$x^2 + x - 2 = (x + 2)(x - 1)$$
$$2x^2 - 2x - 3 = 2x^2 - 3 - 2x = (2x + 1)(x - 3)$$
4. **Simplify the function:**
$$f(x) = \frac{(x + 2)(x - 1)}{(2x + 1)(x - 3)}$$
5. **Find domain restrictions:**
Denominator zero at:
$$2x + 1 = 0 \Rightarrow x = -\frac{1}{2}$$
$$x - 3 = 0 \Rightarrow x = 3$$
So, $x \neq -\frac{1}{2}, 3$.
6. **Find zeros of the function:**
Numerator zero at:
$$x + 2 = 0 \Rightarrow x = -2$$
$$x - 1 = 0 \Rightarrow x = 1$$
7. **Horizontal asymptote:**
Degree numerator = 2, degree denominator = 2.
Leading coefficients ratio:
$$\frac{1}{2}$$
So horizontal asymptote is:
$$y = \frac{1}{2}$$
8. **Summary of key points:**
- Vertical asymptotes at $x = -\frac{1}{2}$ and $x = 3$
- Zeros at $x = -2$ and $x = 1$
- Horizontal asymptote at $y = \frac{1}{2}$
9. **Graphing:** The function behaves like a rational function with these asymptotes and zeros.
Rational Function Be106C
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