Evaluate the limit, if it exists. (If an answer does not exist, enter DNE.) x2 + x - 30 X - 5 lim X→5 -1 Additionol Matorials

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...
icon
Related questions
Question
#7 can you show me how to do this? I’ve attached a copy of my work so you can see how My teacher is teaching this.
### Evaluate the Limit

**Problem Statement:**
Evaluate the limit, if it exists. (If an answer does not exist, enter DNE.)

\[ \lim_{{x \to 5}} \frac{{x^2 + x - 30}}{{x - 5}} \]

**Answer:**
-1 (Incorrect)

---

**Additional Materials:**
- eBook

---

### Explanation:

To solve the limit problem, we need to find the expression's limit as \(x\) approaches 5. The expression given is \(\frac{{x^2 + x - 30}}{{x - 5}}\). 

One common method to solve limits of rational expressions involves factoring. 

1. **Factor the numerator**: Find two numbers that multiply to \(-30\) and sum to \(1\) (the coefficient of \(x\)).
   - The factors are \( (x - 5)(x + 6) \).

2. **Rewrite the expression**:
   - \(\frac{{(x - 5)(x + 6)}}{{x - 5}}\).

3. **Cancel the \((x - 5)\) terms**:
   - \(\lim_{{x \to 5}} (x + 6)\).

4. **Substitute \(x = 5\)**:
   - \(5 + 6 = 11\).

The correct limit is \(11\).

If further understanding is needed, additional resources can be accessed in the eBook provided in the materials section.
Transcribed Image Text:### Evaluate the Limit **Problem Statement:** Evaluate the limit, if it exists. (If an answer does not exist, enter DNE.) \[ \lim_{{x \to 5}} \frac{{x^2 + x - 30}}{{x - 5}} \] **Answer:** -1 (Incorrect) --- **Additional Materials:** - eBook --- ### Explanation: To solve the limit problem, we need to find the expression's limit as \(x\) approaches 5. The expression given is \(\frac{{x^2 + x - 30}}{{x - 5}}\). One common method to solve limits of rational expressions involves factoring. 1. **Factor the numerator**: Find two numbers that multiply to \(-30\) and sum to \(1\) (the coefficient of \(x\)). - The factors are \( (x - 5)(x + 6) \). 2. **Rewrite the expression**: - \(\frac{{(x - 5)(x + 6)}}{{x - 5}}\). 3. **Cancel the \((x - 5)\) terms**: - \(\lim_{{x \to 5}} (x + 6)\). 4. **Substitute \(x = 5\)**: - \(5 + 6 = 11\). The correct limit is \(11\). If further understanding is needed, additional resources can be accessed in the eBook provided in the materials section.
Below is a transcription and description for educational purposes:

---

### Problem Solving with Limits

#### Example Problems:

1. **Problem 9: Evaluate \(\lim_{x \to 4} \frac{\sqrt{x} - 2}{x - 4}\)**

   - **Approach**: Recognize the need to manipulate and simplify the expression.
   - **Step-by-step Solution**:
     1. **Conjugate Method**: Multiply and divide by the conjugate \(\sqrt{x} + 2\).
     2. **Simplification**: Resulting in a limit expression involving \(x - 4\) that can be cancelled.
     3. **Final Calculation**: Evaluate the limit \(\lim_{x \to 4} \frac{1}{\sqrt{x} + 2} = \frac{1}{4}\).

   - **Note**: Additional explanation on how conjugates are used to simplify complex fractions and remove radicals in the denominator.
   - **Diagram**: Not depicted in this transcription, explaining cancellation of \(x - 4\).

2. **Problem 10: Evaluate \(\lim_{x \to 6} \frac{\sqrt{x + 10} - 4}{x - 6}\)**

   - **Approach**: Use of conjugate to eliminate radicals.
   - **Step-by-step Solution**:
     1. **Conjugate**: Multiply by \(\sqrt{x + 10} + 4\).
     2. **Simplification**: Cancelling similar terms.
     3. **Limit Calculation**: \(\lim_{x \to 6} \frac{1}{\sqrt{x + 10} + 4} = \frac{1}{8}\).

   - **Extra Notes**: Annotated explanation about middle term cancellations.

3. **Additional Problems with Limits**:

   - **Problem 5**: \(\lim_{t \to 4} (t - 4)\)
     - **Solution**: Substitute \(t = 4\) directly to find \(6(4) - 4 = 38\).
   
   - **Problem 6**: \(\lim_{x \to 3} \frac{x + 3}{x + 3}\)
     - **Solution**: Simplification yields 1, since
Transcribed Image Text:Below is a transcription and description for educational purposes: --- ### Problem Solving with Limits #### Example Problems: 1. **Problem 9: Evaluate \(\lim_{x \to 4} \frac{\sqrt{x} - 2}{x - 4}\)** - **Approach**: Recognize the need to manipulate and simplify the expression. - **Step-by-step Solution**: 1. **Conjugate Method**: Multiply and divide by the conjugate \(\sqrt{x} + 2\). 2. **Simplification**: Resulting in a limit expression involving \(x - 4\) that can be cancelled. 3. **Final Calculation**: Evaluate the limit \(\lim_{x \to 4} \frac{1}{\sqrt{x} + 2} = \frac{1}{4}\). - **Note**: Additional explanation on how conjugates are used to simplify complex fractions and remove radicals in the denominator. - **Diagram**: Not depicted in this transcription, explaining cancellation of \(x - 4\). 2. **Problem 10: Evaluate \(\lim_{x \to 6} \frac{\sqrt{x + 10} - 4}{x - 6}\)** - **Approach**: Use of conjugate to eliminate radicals. - **Step-by-step Solution**: 1. **Conjugate**: Multiply by \(\sqrt{x + 10} + 4\). 2. **Simplification**: Cancelling similar terms. 3. **Limit Calculation**: \(\lim_{x \to 6} \frac{1}{\sqrt{x + 10} + 4} = \frac{1}{8}\). - **Extra Notes**: Annotated explanation about middle term cancellations. 3. **Additional Problems with Limits**: - **Problem 5**: \(\lim_{t \to 4} (t - 4)\) - **Solution**: Substitute \(t = 4\) directly to find \(6(4) - 4 = 38\). - **Problem 6**: \(\lim_{x \to 3} \frac{x + 3}{x + 3}\) - **Solution**: Simplification yields 1, since
Expert Solution
Step 1

Topic:- Limits 

Correct Answer = 11

steps

Step by step

Solved in 2 steps with 1 images

Blurred answer
Recommended textbooks for you
Calculus: Early Transcendentals
Calculus: Early Transcendentals
Calculus
ISBN:
9781285741550
Author:
James Stewart
Publisher:
Cengage Learning
Thomas' Calculus (14th Edition)
Thomas' Calculus (14th Edition)
Calculus
ISBN:
9780134438986
Author:
Joel R. Hass, Christopher E. Heil, Maurice D. Weir
Publisher:
PEARSON
Calculus: Early Transcendentals (3rd Edition)
Calculus: Early Transcendentals (3rd Edition)
Calculus
ISBN:
9780134763644
Author:
William L. Briggs, Lyle Cochran, Bernard Gillett, Eric Schulz
Publisher:
PEARSON
Calculus: Early Transcendentals
Calculus: Early Transcendentals
Calculus
ISBN:
9781319050740
Author:
Jon Rogawski, Colin Adams, Robert Franzosa
Publisher:
W. H. Freeman
Precalculus
Precalculus
Calculus
ISBN:
9780135189405
Author:
Michael Sullivan
Publisher:
PEARSON
Calculus: Early Transcendental Functions
Calculus: Early Transcendental Functions
Calculus
ISBN:
9781337552516
Author:
Ron Larson, Bruce H. Edwards
Publisher:
Cengage Learning