Find x³e3 dx

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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**Problem Statement:**

Evaluate the definite integral:

\[
\int_{0}^{3} x^3 \, e^{\frac{x}{3}} \, dx
\]

**Solution Outline:**

To solve this integral, we might consider using integration techniques such as integration by parts. Integration by parts is given by the formula:

\[
\int u \, dv = uv - \int v \, du
\]

Choose \( u = x^3 \) and \( dv = e^{\frac{x}{3}} \, dx \).

### Steps:

1. **Differentiate** \( u = x^3 \):
   \[
   du = 3x^2 \, dx
   \]

2. **Integrate** \( dv = e^{\frac{x}{3}} \, dx \):
   \[
   v = 3e^{\frac{x}{3}}
   \]

3. Substitute back into the integration by parts formula:
   \[
   \int x^3 \, e^{\frac{x}{3}} \, dx = x^3 \cdot 3e^{\frac{x}{3}} - \int 3 \cdot 3x^2 \cdot e^{\frac{x}{3}} \, dx
   \]

4. Simplify and compute the remaining integral:
   \[
   = 3x^3 \cdot e^{\frac{x}{3}} - 9 \int x^2 \cdot e^{\frac{x}{3}} \, dx
   \]

5. **Repeat** the integration by parts for the term \(\int x^2 \cdot e^{\frac{x}{3}} \, dx\).

6. **Evaluate** the definite integral from \(0\) to \(3\).

This method will require repeated use of integration by parts until the integral becomes manageable and solvable. Make sure to check boundaries and substitute them back into the integrated result to obtain the final answer.
Transcribed Image Text:**Problem Statement:** Evaluate the definite integral: \[ \int_{0}^{3} x^3 \, e^{\frac{x}{3}} \, dx \] **Solution Outline:** To solve this integral, we might consider using integration techniques such as integration by parts. Integration by parts is given by the formula: \[ \int u \, dv = uv - \int v \, du \] Choose \( u = x^3 \) and \( dv = e^{\frac{x}{3}} \, dx \). ### Steps: 1. **Differentiate** \( u = x^3 \): \[ du = 3x^2 \, dx \] 2. **Integrate** \( dv = e^{\frac{x}{3}} \, dx \): \[ v = 3e^{\frac{x}{3}} \] 3. Substitute back into the integration by parts formula: \[ \int x^3 \, e^{\frac{x}{3}} \, dx = x^3 \cdot 3e^{\frac{x}{3}} - \int 3 \cdot 3x^2 \cdot e^{\frac{x}{3}} \, dx \] 4. Simplify and compute the remaining integral: \[ = 3x^3 \cdot e^{\frac{x}{3}} - 9 \int x^2 \cdot e^{\frac{x}{3}} \, dx \] 5. **Repeat** the integration by parts for the term \(\int x^2 \cdot e^{\frac{x}{3}} \, dx\). 6. **Evaluate** the definite integral from \(0\) to \(3\). This method will require repeated use of integration by parts until the integral becomes manageable and solvable. Make sure to check boundaries and substitute them back into the integrated result to obtain the final answer.
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