Use the sum formulas to find the numerical value. 50 E (4k? + 3) k = 1

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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a. Use the sum formulas to find the numerical value.

50 (4k2 + 3)
 
k = 1

b.

Use the sum formulas to express the following without the summation symbol.
 
n
 
1 − 
i2
n2
 
 
3
n
 
 
i = 1
 
 

 

**Problem Statement**

Use the sum formulas to find the numerical value.

\[
\sum_{k=1}^{50} (4k^2 + 3)
\]

**Explanation**

To solve the problem, follow these general steps:

1. **Understand the Expression:** 
   - This is a summation expression, where \(k\) takes on integer values from 1 to 50.
   - For each value of \(k\), compute \(4k^2 + 3\).

2. **Apply Sum Formulas:** 
   - The expression can be separated into two sums: \(\sum_{k=1}^{50} 4k^2\) and \(\sum_{k=1}^{50} 3\).
   - Use the sum formula for squares: \(\sum_{k=1}^{n} k^2 = \frac{n(n + 1)(2n + 1)}{6}\).
   - Use the sum formula for constants: \(\sum_{k=1}^{n} c = cn\), where \(c\) is a constant.

3. **Calculation:**
   - Calculate \(\sum_{k=1}^{50} 4k^2 = 4 \sum_{k=1}^{50} k^2\).
   - Calculate \(\sum_{k=1}^{50} 3 = 3 \times 50\).

4. **Combine the Results:** 
   - Add the results of the two sums to get the final numerical value.

This mathematical approach leads to the solution of the given summation problem.
Transcribed Image Text:**Problem Statement** Use the sum formulas to find the numerical value. \[ \sum_{k=1}^{50} (4k^2 + 3) \] **Explanation** To solve the problem, follow these general steps: 1. **Understand the Expression:** - This is a summation expression, where \(k\) takes on integer values from 1 to 50. - For each value of \(k\), compute \(4k^2 + 3\). 2. **Apply Sum Formulas:** - The expression can be separated into two sums: \(\sum_{k=1}^{50} 4k^2\) and \(\sum_{k=1}^{50} 3\). - Use the sum formula for squares: \(\sum_{k=1}^{n} k^2 = \frac{n(n + 1)(2n + 1)}{6}\). - Use the sum formula for constants: \(\sum_{k=1}^{n} c = cn\), where \(c\) is a constant. 3. **Calculation:** - Calculate \(\sum_{k=1}^{50} 4k^2 = 4 \sum_{k=1}^{50} k^2\). - Calculate \(\sum_{k=1}^{50} 3 = 3 \times 50\). 4. **Combine the Results:** - Add the results of the two sums to get the final numerical value. This mathematical approach leads to the solution of the given summation problem.
**Expression Simplification Using Sum Formulas**

**Objective:**
Simplify the given expression without using the summation symbol.

**Expression:**
\[
\sum_{i=1}^{n} \left(1 - \frac{i^2}{n^2}\right) \left(\frac{3}{n}\right)
\]

**Approach:**

1. **Expand the Expression:**
   Expand the terms within the summation.

2. **Apply Sum Formulas:**
   Use relevant sum formulas to simplify.

3. **Final Expression:**
   Simplify to remove the summation symbol.

A detailed explanation involves multiplying and collecting like terms, then using known sum formulas such as the sum of integers or sum of squares to simplify fully.
Transcribed Image Text:**Expression Simplification Using Sum Formulas** **Objective:** Simplify the given expression without using the summation symbol. **Expression:** \[ \sum_{i=1}^{n} \left(1 - \frac{i^2}{n^2}\right) \left(\frac{3}{n}\right) \] **Approach:** 1. **Expand the Expression:** Expand the terms within the summation. 2. **Apply Sum Formulas:** Use relevant sum formulas to simplify. 3. **Final Expression:** Simplify to remove the summation symbol. A detailed explanation involves multiplying and collecting like terms, then using known sum formulas such as the sum of integers or sum of squares to simplify fully.
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