Evaluate The Expression When $a=4$ And $b=8$. 9 B − A 9b - A 9 B − A

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Introduction

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In mathematics, evaluating expressions is a crucial skill that helps us solve problems and make calculations. In this article, we will focus on evaluating the expression $9b - a$ when $a=4$ and $b=8$. We will break down the steps involved in evaluating the expression and provide a clear understanding of the process.

Understanding the Expression

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The given expression is $9b - a$. To evaluate this expression, we need to substitute the values of $a$ and $b$ into the expression. The expression consists of two terms: $9b$ and $-a$. The first term is a product of $9$ and $b$, while the second term is the negative of $a$.

Substituting Values

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We are given that $a=4$ and $b=8$. To evaluate the expression, we need to substitute these values into the expression. We will replace $a$ with $4$ and $b$ with $8$ in the expression.

Evaluating the Expression

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Now that we have substituted the values of $a$ and $b$ into the expression, we can evaluate the expression. We will start by evaluating the first term, $9b$. Since $b=8$, we can multiply $9$ by $8$ to get $72$.

Evaluating the First Term

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The first term is $9b$. To evaluate this term, we need to multiply $9$ by $b$. Since $b=8$, we can write:

$$9b = 9 \times 8 = 72$$

Evaluating the Second Term

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The second term is $-a$. To evaluate this term, we need to multiply $-1$ by $a$. Since $a=4$, we can write:

$$-a = -1 \times 4 = -4$$

Combining the Terms

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Now that we have evaluated both terms, we can combine them to get the final result. We will add the two terms together to get the final result.

Combining the Terms

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The final result is obtained by adding the two terms together:

$$9b - a = 72 - 4 = 68$$

Conclusion

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In this article, we evaluated the expression $9b - a$ when $a=4$ and $b=8$. We broke down the steps involved in evaluating the expression and provided a clear understanding of the process. We substituted the values of $a$ and $b$ into the expression and evaluated the two terms separately. Finally, we combined the terms to get the final result.

Frequently Asked Questions

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Q: What is the value of $9b - a$ when $a=4$ and $b=8$?

A: The value of $9b - a$ when $a=4$ and $b=8$ is $68$.

Q: How do I evaluate the expression $9b - a$?

A: To evaluate the expression $9b - a$, you need to substitute the values of $a$ and $b$ into the expression and evaluate the two terms separately. Finally, you need to combine the terms to get the final result.

Q: What is the difference between $9b$ and $-a$?

A: The difference between $9b$ and $-a$ is that $9b$ is a product of $9$ and $b$, while $-a$ is the negative of $a$.

Final Thoughts

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Evaluating expressions is a crucial skill in mathematics that helps us solve problems and make calculations. In this article, we evaluated the expression $9b - a$ when $a=4$ and $b=8$. We broke down the steps involved in evaluating the expression and provided a clear understanding of the process. We hope that this article has provided a clear understanding of how to evaluate expressions and has helped you to improve your math skills.

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Introduction

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In our previous article, we evaluated the expression $9b - a$ when $a=4$ and $b=8$. We broke down the steps involved in evaluating the expression and provided a clear understanding of the process. In this article, we will provide a Q&A guide to help you understand how to evaluate expressions and answer common questions related to evaluating expressions.

Q&A Guide

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Q: What is the value of $2x + 5$ when $x=3$?

A: To evaluate the expression $2x + 5$ when $x=3$, we need to substitute the value of $x$ into the expression. We will replace $x$ with $3$ in the expression and evaluate the expression.

$$2x + 5 = 2(3) + 5 = 6 + 5 = 11$$

Q: How do I evaluate the expression $x^2 - 4$ when $x=2$?

A: To evaluate the expression $x^2 - 4$ when $x=2$, we need to substitute the value of $x$ into the expression. We will replace $x$ with $2$ in the expression and evaluate the expression.

$$x^2 - 4 = (2)^2 - 4 = 4 - 4 = 0$$

Q: What is the difference between $3x$ and $-2x$?

A: The difference between $3x$ and $-2x$ is that $3x$ is a product of $3$ and $x$, while $-2x$ is the negative of $2x$.

Q: How do I evaluate the expression $x^2 + 2x - 3$ when $x=1$?

A: To evaluate the expression $x^2 + 2x - 3$ when $x=1$, we need to substitute the value of $x$ into the expression. We will replace $x$ with $1$ in the expression and evaluate the expression.

$$x^2 + 2x - 3 = (1)^2 + 2(1) - 3 = 1 + 2 - 3 = 0$$

Q: What is the value of $x^2 - 2x + 1$ when $x=1$?

A: To evaluate the expression $x^2 - 2x + 1$ when $x=1$, we need to substitute the value of $x$ into the expression. We will replace $x$ with $1$ in the expression and evaluate the expression.

$$x^2 - 2x + 1 = (1)^2 - 2(1) + 1 = 1 - 2 + 1 = 0$$

Common Mistakes to Avoid

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When evaluating expressions, there are several common mistakes to avoid. Here are some of the most common mistakes:

• Not substituting values correctly: Make sure to substitute the values of variables into the expression correctly.
• Not evaluating expressions in the correct order: Evaluate expressions in the correct order, from left to right.
• Not using parentheses correctly: Use parentheses correctly to group expressions and avoid confusion.
• Not checking for errors: Check your work for errors and make sure that your answer is correct.

Conclusion

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Evaluating expressions is a crucial skill in mathematics that helps us solve problems and make calculations. In this article, we provided a Q&A guide to help you understand how to evaluate expressions and answer common questions related to evaluating expressions. We hope that this article has provided a clear understanding of how to evaluate expressions and has helped you to improve your math skills.

Final Thoughts

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Evaluating expressions is a skill that takes practice to develop. With practice and patience, you can become proficient in evaluating expressions and solving problems. Remember to always check your work for errors and make sure that your answer is correct.