Evaluating the First Expression

Oct 13, 2025 by windailys.com 126 views

Introduction

In mathematics, evaluating expressions for a given value of a variable is a fundamental concept that helps us understand the behavior of functions and make predictions about real-world phenomena. In this article, we will evaluate two mathematical expressions for x = 2, and discuss the importance of this concept in mathematics and its applications.

Evaluating the First Expression

The first expression we need to evaluate is -9.2(4 - x). To do this, we need to substitute x = 2 into the expression and simplify.

Substituting x = 2 into the Expression

When we substitute x = 2 into the expression -9.2(4 - x), we get:

-9.2(4 - 2)

Simplifying the Expression

Now, we need to simplify the expression by evaluating the expression inside the parentheses.

4 - 2 = 2

So, the expression becomes:

-9.2(2)

Evaluating the Expression

Finally, we need to evaluate the expression by multiplying -9.2 by 2.

-9.2(2) = -18.4

Therefore, the value of the expression -9.2(4 - x) for x = 2 is -18.4.

Evaluating the Second Expression

The second expression we need to evaluate is -36.8 + 9.2x. To do this, we need to substitute x = 2 into the expression and simplify.

Substituting x = 2 into the Expression

When we substitute x = 2 into the expression -36.8 + 9.2x, we get:

-36.8 + 9.2(2)

Simplifying the Expression

Now, we need to simplify the expression by evaluating the expression inside the parentheses.

9.2(2) = 18.4

So, the expression becomes:

-36.8 + 18.4

Evaluating the Expression

Finally, we need to evaluate the expression by adding -36.8 and 18.4.

-36.8 + 18.4 = -18.4

Therefore, the value of the expression -36.8 + 9.2x for x = 2 is -18.4.

Discussion

Evaluating mathematical expressions for a given value of a variable is an essential concept in mathematics that helps us understand the behavior of functions and make predictions about real-world phenomena. In this article, we evaluated two mathematical expressions for x = 2 and discussed the importance of this concept in mathematics and its applications.

Importance of Evaluating Mathematical Expressions

Evaluating mathematical expressions for a given value of a variable is important because it helps us:

Understand the behavior of functions
Make predictions about real-world phenomena
Solve problems in mathematics and other fields
Develop critical thinking and problem-solving skills

Applications of Evaluating Mathematical Expressions

Evaluating mathematical expressions for a given value of a variable has many applications in mathematics and other fields, including:

Algebra: Evaluating expressions is a fundamental concept in algebra that helps us solve equations and inequalities.
Calculus: Evaluating expressions is used to find the derivative and integral of functions.
Physics: Evaluating expressions is used to model real-world phenomena, such as motion and energy.
Engineering: Evaluating expressions is used to design and optimize systems, such as bridges and buildings.

Conclusion

In conclusion, evaluating mathematical expressions for a given value of a variable is an essential concept in mathematics that helps us understand the behavior of functions and make predictions about real-world phenomena. In this article, we evaluated two mathematical expressions for x = 2 and discussed the importance of this concept in mathematics and its applications. We hope that this article has helped you understand the concept of evaluating mathematical expressions and its importance in mathematics and other fields.

Introduction

In our previous article, we evaluated two mathematical expressions for x = 2 and discussed the importance of this concept in mathematics and its applications. In this article, we will answer some frequently asked questions about evaluating mathematical expressions for a given value of a variable.

Q&A

Q: What is the purpose of evaluating mathematical expressions for a given value of a variable?

A: The purpose of evaluating mathematical expressions for a given value of a variable is to understand the behavior of functions and make predictions about real-world phenomena.

Q: How do I evaluate a mathematical expression for a given value of a variable?

A: To evaluate a mathematical expression for a given value of a variable, you need to substitute the value of the variable into the expression and simplify.

Q: What are some common mistakes to avoid when evaluating mathematical expressions for a given value of a variable?

A: Some common mistakes to avoid when evaluating mathematical expressions for a given value of a variable include:

Not substituting the value of the variable into the expression
Not simplifying the expression after substitution
Not following the order of operations (PEMDAS)

Q: How do I know if I have evaluated a mathematical expression correctly for a given value of a variable?

A: To check if you have evaluated a mathematical expression correctly for a given value of a variable, you can:

Plug the value of the variable back into the expression and simplify
Use a calculator or computer program to evaluate the expression
Check your work with a peer or teacher

Q: Can I evaluate mathematical expressions for any value of a variable?

A: Yes, you can evaluate mathematical expressions for any value of a variable. However, some expressions may not be defined for certain values of the variable, such as division by zero.

Q: How do I apply evaluating mathematical expressions for a given value of a variable to real-world problems?

A: To apply evaluating mathematical expressions for a given value of a variable to real-world problems, you can:

Use mathematical models to describe real-world phenomena
Substitute real-world values into mathematical expressions
Use the results to make predictions or recommendations

Q: What are some common applications of evaluating mathematical expressions for a given value of a variable?

A: Some common applications of evaluating mathematical expressions for a given value of a variable include:

Algebra: Evaluating expressions is a fundamental concept in algebra that helps us solve equations and inequalities.
Calculus: Evaluating expressions is used to find the derivative and integral of functions.
Physics: Evaluating expressions is used to model real-world phenomena, such as motion and energy.
Engineering: Evaluating expressions is used to design and optimize systems, such as bridges and buildings.

Conclusion

In conclusion, evaluating mathematical expressions for a given value of a variable is an essential concept in mathematics that helps us understand the behavior of functions and make predictions about real-world phenomena. We hope that this article has helped you understand the concept of evaluating mathematical expressions and its importance in mathematics and other fields.

Additional Resources

Khan Academy: Evaluating Expressions
Mathway: Evaluating Expressions
Wolfram Alpha: Evaluating Expressions

Final Thoughts

Evaluating mathematical expressions for a given value of a variable is a fundamental concept in mathematics that has many applications in real-world problems. By understanding this concept, you can develop critical thinking and problem-solving skills, and apply mathematical models to describe and analyze real-world phenomena.