Determine the intervals on which the function is concave up or down and find the points of inflection. f(x) %3D бх3 — 11х? + 7 (Give your answer as a comma-separated list of points in the form (* , *). Express numbers in exact form. Use symbolic notation and fractions where needed.) points of inflection: Determine the interval on which ƒ is concave up. (Give your answer as an interval in the form (*, *). Use the symbol ∞ for infinity, U for combining intervals, and an appropriate type of parenthesis "(",")", "[","]" depending on whether the interval is open or closed. Enter Ø if the interval is empty. Express numbers in exact form. Use symbolic notation and fractions where needed.) Determine the interval on which ƒ is concave down. (Give your answer as an interval in the form (*, *). Use the symbol ∞ for infinity, U for combining intervals, and an appropriate type of parenthesis "(",")", "[","]" depending on whether the interval is open or closed. Enter Ø if the interval is empty. Express numbers in exact form. Use symbolic notation and fractions where needed.) хе

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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### Concavity and Points of Inflection

#### Problem:
Determine the intervals on which the function is concave up or down and find the points of inflection.

#### Function:
\[ f(x) = 6x^3 - 11x^2 + 7 \]

#### Instructions:
- Provide your answer as a comma-separated list of points in the form \((*, *)\).
- Express numbers in exact form. Use symbolic notation and fractions where needed.

##### Points of Inflection:
- Find the points of inflection by identifying points where the concavity changes.

##### Determine the Interval on which \( f \) is Concave Up:
- Provide your answer as an interval in the form \((*, *)\).
- Use the symbol \( \infty \) for infinity, \(\cup\) for combining intervals.
- Use parentheses "\( (, ) \)", "\([, ]\)" depending on whether the interval is open or closed.
- Enter \(\emptyset\) if the interval is empty.

\[ x \in \]

##### Determine the Interval on which \( f \) is Concave Down:
- Provide your answer as an interval in the form \((*, *)\).
- Use the symbol \( \infty \) for infinity, \(\cup\) for combining intervals.
- Use parentheses "\( (, ) \)", "\([, ]\)" depending on whether the interval is open or closed.
- Enter \(\emptyset\) if the interval is empty.

\[ x \in \]
Transcribed Image Text:### Concavity and Points of Inflection #### Problem: Determine the intervals on which the function is concave up or down and find the points of inflection. #### Function: \[ f(x) = 6x^3 - 11x^2 + 7 \] #### Instructions: - Provide your answer as a comma-separated list of points in the form \((*, *)\). - Express numbers in exact form. Use symbolic notation and fractions where needed. ##### Points of Inflection: - Find the points of inflection by identifying points where the concavity changes. ##### Determine the Interval on which \( f \) is Concave Up: - Provide your answer as an interval in the form \((*, *)\). - Use the symbol \( \infty \) for infinity, \(\cup\) for combining intervals. - Use parentheses "\( (, ) \)", "\([, ]\)" depending on whether the interval is open or closed. - Enter \(\emptyset\) if the interval is empty. \[ x \in \] ##### Determine the Interval on which \( f \) is Concave Down: - Provide your answer as an interval in the form \((*, *)\). - Use the symbol \( \infty \) for infinity, \(\cup\) for combining intervals. - Use parentheses "\( (, ) \)", "\([, ]\)" depending on whether the interval is open or closed. - Enter \(\emptyset\) if the interval is empty. \[ x \in \]
### Calculating Limits Using L'Hôpital's Rule

#### Problem Statement
Consider the limit:
\[
\lim_{x \to 0} \left[(\cos(x) + 6x)^{1/(7 \sin(x))}\right],
\]
which leads to the indeterminate form \(1^\infty\).

#### Methodology
1. **Substitution and Transformation:**
   - Set \(y = (\cos(x) + 6x)^{1/(7 \sin(x))}\) and use L'Hôpital’s Rule to find:
   \[
   \lim_{x \to 0} \ln(y) = \lim_{x \to 0} \ln\left[(\cos(x) + 6x)^{1/(7 \sin(x))}\right].
   \]

2. **Finding the Limit of the Logarithmic Form:**
   - Calculate the limit:
   \[
   \lim_{x \to 0} \ln\left[(\cos(x) + 6x)^{1/(7 \sin(x))}\right] = \boxed{\phantom{0}}
   \]

3. **Using the Result:**
   - Use the above result to find the limit:
   \[
   \lim_{x \to 0} y = \lim_{x \to 0} \left[(\cos(x) + 6x)^{1/(7 \sin(x))}\right].
   \]

4. **Final Calculation:**
   - Calculate the final limit:
   \[
   \lim_{x \to 0} \left[(\cos(x) + 6x)^{1/(7 \sin(x))}\right] = \boxed{\phantom{0}}
   \]

#### Explanation
The problem involves finding the limit of an expression that at first glance appears indeterminate. By transforming the expression using logarithms, we apply L'Hôpital's Rule to resolve the indeterminacy and compute the limit.

Note: \(\boxed{\phantom{0}}\) signifies fields where further detailed computation is required to obtain specific numerical results.
Transcribed Image Text:### Calculating Limits Using L'Hôpital's Rule #### Problem Statement Consider the limit: \[ \lim_{x \to 0} \left[(\cos(x) + 6x)^{1/(7 \sin(x))}\right], \] which leads to the indeterminate form \(1^\infty\). #### Methodology 1. **Substitution and Transformation:** - Set \(y = (\cos(x) + 6x)^{1/(7 \sin(x))}\) and use L'Hôpital’s Rule to find: \[ \lim_{x \to 0} \ln(y) = \lim_{x \to 0} \ln\left[(\cos(x) + 6x)^{1/(7 \sin(x))}\right]. \] 2. **Finding the Limit of the Logarithmic Form:** - Calculate the limit: \[ \lim_{x \to 0} \ln\left[(\cos(x) + 6x)^{1/(7 \sin(x))}\right] = \boxed{\phantom{0}} \] 3. **Using the Result:** - Use the above result to find the limit: \[ \lim_{x \to 0} y = \lim_{x \to 0} \left[(\cos(x) + 6x)^{1/(7 \sin(x))}\right]. \] 4. **Final Calculation:** - Calculate the final limit: \[ \lim_{x \to 0} \left[(\cos(x) + 6x)^{1/(7 \sin(x))}\right] = \boxed{\phantom{0}} \] #### Explanation The problem involves finding the limit of an expression that at first glance appears indeterminate. By transforming the expression using logarithms, we apply L'Hôpital's Rule to resolve the indeterminacy and compute the limit. Note: \(\boxed{\phantom{0}}\) signifies fields where further detailed computation is required to obtain specific numerical results.
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