Values to Use for Each Term

Oct 13, 2025 by wbrum.org 142 views

Understanding the Function f(x) = x(5-x) and Its Variations

In mathematics, functions are used to describe the relationship between variables. The given function f(x) = x(5-x) is a quadratic function that represents a parabola. When dealing with functions, it's essential to understand how they change when the input variable changes. In this article, we'll explore the function f(x) = x(5-x) and its variations, specifically when delta x is positive.

The Function f(x) = x(5-x)

The function f(x) = x(5-x) is a quadratic function that can be rewritten as f(x) = 5x - x^2. This function represents a parabola that opens downwards, with its vertex at (2.5, 6.25). The function has a maximum value at the vertex, and it decreases as we move away from the vertex.

Understanding Delta x

Delta x (Δx) represents a small change in the input variable x. When Δx is positive, it means that the input variable x is increasing. In this case, we need to find the values of f(x+Δx) and understand how the function changes when x increases.

Finding f(x+Δx)

To find f(x+Δx), we need to substitute (x+Δx) into the function f(x) = x(5-x). This gives us:

f(x+Δx) = (x+Δx)(5-(x+Δx))

Expanding the expression, we get:

f(x+Δx) = 5x + 5Δx - x^2 - xΔx - Δx^2

Simplifying the expression, we get:

f(x+Δx) = -x^2 + 5x + 5Δx - xΔx - Δx^2

Values to Use for Each Term

When Δx is positive, we need to use the following values for each term:

-x^2: This term represents the quadratic term of the original function. Since Δx is positive, we can use the same value for this term.
5x: This term represents the linear term of the original function. Since Δx is positive, we can use the same value for this term.
5Δx: This term represents the change in the linear term due to the increase in x. We can use the value of 5Δx to represent this change.
-xΔx: This term represents the change in the quadratic term due to the increase in x. We can use the value of -xΔx to represent this change.
-Δx^2: This term represents the change in the quadratic term due to the increase in x. We can use the value of -Δx^2 to represent this change.

In conclusion, when Δx is positive, we need to use the following values for each term in the expression f(x+Δx):

-x^2
5x
5Δx
-xΔx
-Δx^2

These values help us understand how the function f(x) = x(5-x) changes when the input variable x increases. By using these values, we can analyze the behavior of the function and make predictions about its behavior in different scenarios.

To further analyze the behavior of the function f(x) = x(5-x), we can use the following techniques:

Graphing: We can graph the function f(x) = x(5-x) to visualize its behavior.
Derivatives: We can find the derivative of the function f(x) = x(5-x) to analyze its behavior.
Limits: We can find the limits of the function f(x) = x(5-x) as x approaches positive or negative infinity to analyze its behavior.

By using these techniques, we can gain a deeper understanding of the function f(x) = x(5-x) and its variations.

The function f(x) = x(5-x) has several real-world applications, including:

Optimization: The function f(x) = x(5-x) can be used to optimize problems that involve quadratic functions.
Physics: The function f(x) = x(5-x) can be used to model the motion of objects that follow quadratic trajectories.
Economics: The function f(x) = x(5-x) can be used to model the behavior of economic systems that involve quadratic functions.

By understanding the function f(x) = x(5-x) and its variations, we can apply it to real-world problems and make predictions about its behavior.

In conclusion, the function f(x) = x(5-x) is a quadratic function that represents a parabola. When Δx is positive, we need to use the following values for each term in the expression f(x+Δx):

-x^2
5x
5Δx
-xΔx
-Δx^2

Q: What is the function f(x) = x(5-x)?

A: The function f(x) = x(5-x) is a quadratic function that represents a parabola. It can be rewritten as f(x) = 5x - x^2.

Q: What is the vertex of the parabola represented by the function f(x) = x(5-x)?

A: The vertex of the parabola represented by the function f(x) = x(5-x) is at (2.5, 6.25).

Q: What happens to the function f(x) = x(5-x) when Δx is positive?

A: When Δx is positive, the function f(x) = x(5-x) increases. We need to use the following values for each term in the expression f(x+Δx):

-x^2
5x
5Δx
-xΔx
-Δx^2

Q: How can we analyze the behavior of the function f(x) = x(5-x)?

A: We can analyze the behavior of the function f(x) = x(5-x) by using the following techniques:

Graphing: We can graph the function f(x) = x(5-x) to visualize its behavior.
Derivatives: We can find the derivative of the function f(x) = x(5-x) to analyze its behavior.
Limits: We can find the limits of the function f(x) = x(5-x) as x approaches positive or negative infinity to analyze its behavior.

Q: What are some real-world applications of the function f(x) = x(5-x)?

A: The function f(x) = x(5-x) has several real-world applications, including:

Optimization: The function f(x) = x(5-x) can be used to optimize problems that involve quadratic functions.
Physics: The function f(x) = x(5-x) can be used to model the motion of objects that follow quadratic trajectories.
Economics: The function f(x) = x(5-x) can be used to model the behavior of economic systems that involve quadratic functions.

Q: How can we use the function f(x) = x(5-x) to solve problems?

A: We can use the function f(x) = x(5-x) to solve problems by applying it to real-world scenarios. For example, we can use the function to model the motion of an object that follows a quadratic trajectory, or to optimize a problem that involves quadratic functions.

Q: What are some common mistakes to avoid when working with the function f(x) = x(5-x)?

A: Some common mistakes to avoid when working with the function f(x) = x(5-x) include:

Not considering the vertex of the parabola: The vertex of the parabola represented by the function f(x) = x(5-x) is at (2.5, 6.25). It's essential to consider the vertex when analyzing the behavior of the function.
Not using the correct values for each term: When Δx is positive, we need to use the following values for each term in the expression f(x+Δx):
- -x^2
- 5x
- 5Δx
- -xΔx
- -Δx^2

Q: How can we verify the results obtained from the function f(x) = x(5-x)?

A: We can verify the results obtained from the function f(x) = x(5-x) by using different techniques, such as:

Graphing: We can graph the function f(x) = x(5-x) to visualize its behavior.
Derivatives: We can find the derivative of the function f(x) = x(5-x) to analyze its behavior.
Limits: We can find the limits of the function f(x) = x(5-x) as x approaches positive or negative infinity to analyze its behavior.

By using these techniques, we can verify the results obtained from the function f(x) = x(5-x) and ensure that they are accurate.

In conclusion, the function f(x) = x(5-x) is a quadratic function that represents a parabola. When Δx is positive, we need to use the following values for each term in the expression f(x+Δx):

-x^2
5x
5Δx
-xΔx
-Δx^2

By understanding these values, we can analyze the behavior of the function f(x) = x(5-x) and make predictions about its behavior in different scenarios. The function f(x) = x(5-x) has several real-world applications, including optimization, physics, and economics. By applying the function f(x) = x(5-x) to real-world problems, we can gain a deeper understanding of its behavior and make predictions about its behavior in different scenarios.