1. **Problem Statement:** Given the function $$g(x) = \frac{2x^3 - 2x^2 + 8x - 8}{x^3 - x^2 - 9x + 9},$$ find the holes, horizontal asymptotes, vertical asymptotes, x-intercepts, y-intercepts, domain, range, and sketch the graph.
2. **Step 1: Factor numerator and denominator to simplify and identify holes and asymptotes.**
Factor numerator:
$$2x^3 - 2x^2 + 8x - 8 = 2(x^3 - x^2 + 4x - 4).$$
Group terms:
$$x^3 - x^2 + 4x - 4 = (x^3 - x^2) + (4x - 4) = x^2(x - 1) + 4(x - 1) = (x - 1)(x^2 + 4).$$
So numerator:
$$2(x - 1)(x^2 + 4).$$
Factor denominator:
$$x^3 - x^2 - 9x + 9 = (x^3 - x^2) - (9x - 9) = x^2(x - 1) - 9(x - 1) = (x - 1)(x^2 - 9).$$
Further factor:
$$x^2 - 9 = (x - 3)(x + 3).$$
So denominator:
$$(x - 1)(x - 3)(x + 3).$$
3. **Step 2: Simplify the function by canceling common factors.**
$$g(x) = \frac{2\cancel{(x - 1)}(x^2 + 4)}{\cancel{(x - 1)}(x - 3)(x + 3)} = \frac{2(x^2 + 4)}{(x - 3)(x + 3)}.$$
4. **Step 3: Identify holes.**
Holes occur where factors cancel out, here at $$x = 1$$.
5. **Step 4: Horizontal asymptotes.**
Degree numerator = 2, degree denominator = 2.
For rational functions where degrees are equal, horizontal asymptote is ratio of leading coefficients.
Leading coefficient numerator after simplification: $$2 \times 1 = 2$$ (from $$2x^2$$ term).
Leading coefficient denominator: $$1$$ (from $$x^2$$ term in $$(x-3)(x+3) = x^2 - 9$$).
So horizontal asymptote:
$$y = \frac{2}{1} = 2.$$
6. **Step 5: Vertical asymptotes.**
Vertical asymptotes occur where denominator is zero and factor is not canceled.
Denominator factors after simplification: $$(x - 3)(x + 3)$$.
So vertical asymptotes at $$x = 3$$ and $$x = -3$$.
7. **Step 6: X-intercepts.**
Set numerator equal to zero:
$$2(x^2 + 4) = 0 \implies x^2 + 4 = 0 \implies x^2 = -4,$$
which has no real solutions.
So, no x-intercepts.
8. **Step 7: Y-intercept.**
Evaluate $$g(0)$$:
$$g(0) = \frac{2(0^2 + 4)}{(0 - 3)(0 + 3)} = \frac{2(4)}{-3 \times 3} = \frac{8}{-9} = -\frac{8}{9}.$$
9. **Step 8: Domain.**
Domain excludes values making denominator zero before simplification:
$$x \neq 1, 3, -3.$$
10. **Step 9: Range.**
Range is all real numbers except the horizontal asymptote value if the function never reaches it.
Since horizontal asymptote is $$y=2$$ and the function approaches but never equals 2, range is:
$$(-\infty, 2) \cup (2, \infty).$$
11. **Step 10: Summary:**
- Holes: $$x=1$$
- Horizontal asymptote: $$y=2$$
- Vertical asymptotes: $$x=3, x=-3$$
- X-intercepts: none
- Y-intercept: $$y = -\frac{8}{9}$$
- Domain: $$\{x | x \neq -3, 1, 3\}$$
- Range: $$(-\infty, 2) \cup (2, \infty)$$
12. **Step 11: Sketch graph**
Use vertical asymptotes at $$x=\pm 3$$, hole at $$x=1$$, horizontal asymptote at $$y=2$$, and y-intercept at $$-8/9$$.
Rational Function Analysis Acabcf
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