1. **Stating the problem:**
Simplify the product of the two rational expressions:
$$\frac{a^2 + 4a + 4}{2 - a} \cdot \frac{2a^2 - 8a + 8}{a^2 - 4}$$
2. **Recall important formulas and rules:**
- Factor quadratic expressions when possible.
- Remember difference of squares: $$x^2 - y^2 = (x - y)(x + y)$$
- When multiplying fractions, multiply numerators together and denominators together.
- Simplify by canceling common factors.
3. **Factor each polynomial:**
- $$a^2 + 4a + 4 = (a + 2)^2$$
- $$2a^2 - 8a + 8 = 2(a^2 - 4a + 4) = 2(a - 2)^2$$
- $$a^2 - 4 = (a - 2)(a + 2)$$
4. **Rewrite the expression with factored forms:**
$$\frac{(a + 2)^2}{2 - a} \cdot \frac{2(a - 2)^2}{(a - 2)(a + 2)}$$
5. **Simplify the denominator $$2 - a$$:**
Note that $$2 - a = -(a - 2)$$, so:
$$\frac{(a + 2)^2}{-(a - 2)} \cdot \frac{2(a - 2)^2}{(a - 2)(a + 2)}$$
6. **Multiply numerators and denominators:**
Numerator:
$$(a + 2)^2 \cdot 2 (a - 2)^2 = 2 (a + 2)^2 (a - 2)^2$$
Denominator:
$$-(a - 2) \cdot (a - 2)(a + 2) = - (a - 2)^2 (a + 2)$$
7. **Write the fraction:**
$$\frac{2 (a + 2)^2 (a - 2)^2}{- (a - 2)^2 (a + 2)}$$
8. **Cancel common factors:**
Cancel $$(a - 2)^2$$ from numerator and denominator:
$$\frac{2 (a + 2)^2 \cancel{(a - 2)^2}}{- \cancel{(a - 2)^2} (a + 2)} = \frac{2 (a + 2)^2}{- (a + 2)}$$
9. **Simplify further:**
Cancel one $$(a + 2)$$:
$$\frac{2 \cancel{(a + 2)} (a + 2)}{- \cancel{(a + 2)}} = \frac{2 (a + 2)}{-1} = -2 (a + 2)$$
10. **Final answer:**
$$\boxed{-2 (a + 2)}$$
This matches the expected result.
Multiply Rational Expressions 0127B5
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