Evaluate as power series and determine the radius of convergence. x2 -dx 5+ 2x

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Must be simplified but remain in exact form (no rounding)

**Problem Statement:**
Evaluate the following integral as a power series and determine the radius of convergence:

\[ \int \frac{x^2}{5 + 2x} \, dx \]

**Instructions for Solution:**

1. **Identify the Series Expression:** 
   Decompose the integrand \(\frac{x^2}{5 + 2x}\) into a form suitable for series expansion.

2. **Expand into Power Series:**
   Use the geometric series and other relevant series expansions to express \(\frac{1}{5 + 2x}\) as a power series.

3. **Integrate Term by Term:**
   Once the power series for the integrand is determined, perform term-by-term integration on the series.

4. **Determine the Radius of Convergence:**
   Apply the ratio test or other convergence tests to find the interval of convergence for the series.

5. **Summarize the Result:**
   Write the resulting power series and clearly state the radius of convergence.

**Note:** There are no graphs or diagrams included in this problem statement. The main focus is on the algebraic manipulation and series expansion.

**Solution Outline:**

1. **Rewrite Integrand for Series Expansion:**
   \[ \frac{x^2}{5 + 2x} = x^2 \cdot \frac{1}{5} \cdot \frac{1}{1 + \frac{2x}{5}} \]

2. **Use Geometric Series Expansion:**
   \[ \frac{1}{1 + \frac{2x}{5}} = \sum_{n=0}^{\infty} \left(-\frac{2x}{5}\right)^n \]

3. **Write the Power Series:**
   \[ \frac{x^2}{5 + 2x} = \frac{x^2}{5} \sum_{n=0}^{\infty} \left(-\frac{2x}{5}\right)^n = \sum_{n=0}^{\infty} \frac{x^2}{5} \left(-\frac{2x}{5}\right)^n \]

4. **Simplify and Integrate Term by Term:**
   \[ \int \sum_{n=0}^{\infty} \frac{x^2}{5} \left(-\frac{2x}{5}\right)^
Transcribed Image Text:**Problem Statement:** Evaluate the following integral as a power series and determine the radius of convergence: \[ \int \frac{x^2}{5 + 2x} \, dx \] **Instructions for Solution:** 1. **Identify the Series Expression:** Decompose the integrand \(\frac{x^2}{5 + 2x}\) into a form suitable for series expansion. 2. **Expand into Power Series:** Use the geometric series and other relevant series expansions to express \(\frac{1}{5 + 2x}\) as a power series. 3. **Integrate Term by Term:** Once the power series for the integrand is determined, perform term-by-term integration on the series. 4. **Determine the Radius of Convergence:** Apply the ratio test or other convergence tests to find the interval of convergence for the series. 5. **Summarize the Result:** Write the resulting power series and clearly state the radius of convergence. **Note:** There are no graphs or diagrams included in this problem statement. The main focus is on the algebraic manipulation and series expansion. **Solution Outline:** 1. **Rewrite Integrand for Series Expansion:** \[ \frac{x^2}{5 + 2x} = x^2 \cdot \frac{1}{5} \cdot \frac{1}{1 + \frac{2x}{5}} \] 2. **Use Geometric Series Expansion:** \[ \frac{1}{1 + \frac{2x}{5}} = \sum_{n=0}^{\infty} \left(-\frac{2x}{5}\right)^n \] 3. **Write the Power Series:** \[ \frac{x^2}{5 + 2x} = \frac{x^2}{5} \sum_{n=0}^{\infty} \left(-\frac{2x}{5}\right)^n = \sum_{n=0}^{\infty} \frac{x^2}{5} \left(-\frac{2x}{5}\right)^n \] 4. **Simplify and Integrate Term by Term:** \[ \int \sum_{n=0}^{\infty} \frac{x^2}{5} \left(-\frac{2x}{5}\right)^
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