1. **State the problem:**
Graph the function $$f(x) = \frac{2x^4 - x^2 + 1}{x^2 - 4}$$ and analyze its key features.
2. **Identify domain restrictions:**
The denominator is $$x^2 - 4 = (x-2)(x+2)$$ which is zero at $$x=2$$ and $$x=-2$$.
These points are vertical asymptotes because the function is undefined there.
3. **Analyze end behavior:**
For large $$|x|$$, the highest degree terms dominate.
The numerator behaves like $$2x^4$$ and the denominator like $$x^2$$.
So, $$f(x) \approx \frac{2x^4}{x^2} = 2x^2$$ for large $$|x|$$.
This means the function grows approximately like $$2x^2$$ as $$x \to \pm \infty$$.
4. **Find horizontal or oblique asymptotes:**
Since the degree of numerator (4) is greater than denominator (2), no horizontal asymptote.
Instead, the function behaves like $$2x^2$$ for large $$|x|$$, so the graph will resemble a parabola opening upward far from the origin.
5. **Check for intercepts:**
- **y-intercept:** Evaluate $$f(0) = \frac{2(0)^4 - (0)^2 + 1}{0^2 - 4} = \frac{1}{-4} = -\frac{1}{4}$$.
- **x-intercepts:** Solve numerator $$2x^4 - x^2 + 1 = 0$$.
Let $$y = x^2$$, then $$2y^2 - y + 1 = 0$$.
Discriminant $$\Delta = (-1)^2 - 4 \cdot 2 \cdot 1 = 1 - 8 = -7 < 0$$, so no real roots.
No x-intercepts.
6. **Summary:**
- Vertical asymptotes at $$x = \pm 2$$.
- No x-intercepts.
- y-intercept at $$\left(0, -\frac{1}{4}\right)$$.
- End behavior like $$2x^2$$.
This describes the graph's main features.
Rational Function 19A701
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