resources, the logistic model is a more appropriate model. The general form of the logistic equation is: 1(2) = Á for positive constants L, A and k. (a) Show that f(2) is always increasing. (b) What is the limit as z gets very large, ie. what is lim f(z). (e) Find a formula for the inflection point, in terms of L, A and k.

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### Logistic Growth Model in Population Dynamics

**Overview:**

Populations tend to grow exponentially when resources are unlimited. However, when there are resource constraints, the logistic model better represents population growth. The general form of the logistic equation is given by:

\[ f(x) = \frac{L}{1 + Ae^{-kx}} \]

for positive constants \( L \), \( A \), and \( k \).

**Tasks:**

(a) **Show that \( f(x) \) is always increasing.**

This requires demonstrating that the derivative of \( f(x) \) is positive for all \( x \).

(b) **Find the limit as \( x \) approaches infinity, i.e., determine \( \lim_{x \to \infty} f(x) \).**

This involves evaluating the behavior of \( f(x) \) as \( x \) becomes very large.

(c) **Derive a formula for the inflection point in terms of \( L \), \( A \), and \( k \).**

The inflection point is where the second derivative of \( f(x) \) changes sign, indicating a shift in concavity.

(d) **Determine where \( f(x) \) is concave-up and where it is concave-down.**

This task involves analyzing the second derivative to find intervals where it is positive (concave-up) and negative (concave-down).

**Graph and Diagram Explanation (if applicable):**

There are no graphs or diagrams accompanying this text. However, typically, a logistic growth curve is S-shaped, starting at a low value, rising steeply, and then leveling off as it approaches a carrying capacity, \( L \). The point of inflection is where the curve changes from being concave-up to concave-down.
Transcribed Image Text:### Logistic Growth Model in Population Dynamics **Overview:** Populations tend to grow exponentially when resources are unlimited. However, when there are resource constraints, the logistic model better represents population growth. The general form of the logistic equation is given by: \[ f(x) = \frac{L}{1 + Ae^{-kx}} \] for positive constants \( L \), \( A \), and \( k \). **Tasks:** (a) **Show that \( f(x) \) is always increasing.** This requires demonstrating that the derivative of \( f(x) \) is positive for all \( x \). (b) **Find the limit as \( x \) approaches infinity, i.e., determine \( \lim_{x \to \infty} f(x) \).** This involves evaluating the behavior of \( f(x) \) as \( x \) becomes very large. (c) **Derive a formula for the inflection point in terms of \( L \), \( A \), and \( k \).** The inflection point is where the second derivative of \( f(x) \) changes sign, indicating a shift in concavity. (d) **Determine where \( f(x) \) is concave-up and where it is concave-down.** This task involves analyzing the second derivative to find intervals where it is positive (concave-up) and negative (concave-down). **Graph and Diagram Explanation (if applicable):** There are no graphs or diagrams accompanying this text. However, typically, a logistic growth curve is S-shaped, starting at a low value, rising steeply, and then leveling off as it approaches a carrying capacity, \( L \). The point of inflection is where the curve changes from being concave-up to concave-down.
Expert Solution
Step 1

Consider the given general form of the logistic equation:

fx=L1+Ae-kx

Where, L, A, and K is positive number.

Here, the objective is to find the following:

1) Show that f(x) is always increasing

2) find limxfx

3) find the formula for inflection point.

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