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The image you shared contains information regarding the evaluation of an integral of the form:

\[
\int_{-\infty}^{\infty} x^n e^{-\alpha x^2} dx
\]

### Key points from the image:
1. **Odd powers of \( x \)**: 
   - For odd \( n = 2m + 1 \), the integral evaluates to zero due to symmetry:
   \[
   I_{2m+1} = 0
   \]
   
2. **Even powers of \( x \)**: 
   - For even \( n = 2m \), the general formula is:
   \[
   I_{2m} = \frac{(2m-1)!!}{(2\alpha)^m} \sqrt{\frac{\pi}{\alpha}}
   \]
   
3. **Final result**: This provides the general result for the integral of \( x^n e^{-\alpha x^2} \) over \( (-\infty, \infty) \), where:
   - For odd \( n \), the integral is zero.
   - For even \( n \), it follows the formula given above.

Would you like further clarification or details on any step?

Here are 5 related questions you can explore:
1. Why does the integral evaluate to zero for odd powers of \( x \)?
2. What is the role of the double factorial \( (2m - 1)!! \) in the formula for even \( n \)?
3. How can we derive this formula from first principles using integration techniques?
4. What are the practical applications of integrals of this form in physics or engineering?
5. How does the result change if \( \alpha \) varies in the exponential term \( e^{-\alpha x^2} \)?

**Tip**: Symmetry in definite integrals over symmetric intervals like \( (-\infty, \infty) \) is a powerful tool that often simplifies calculations.

Evaluate the integral of x^n e^{-ax^2} over (-∞, ∞).

Explore the integral of x^n e^{-ax^2} over (-∞, ∞) with a detailed solution. This problem highlights key concepts in Gaussian integrals, symmetry in definite integrals, and provides formulas for both even and odd powers of x.

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