Identify the logical operator

Oct 13, 2025 by wbrum.org 7 views

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Introduction

In mathematics, inequalities are used to describe relationships between variables. Compound inequalities, in particular, involve multiple inequalities joined by logical operators such as "and" or "or." In this article, we will focus on solving compound inequalities, specifically the inequality $|3x + 2| \ \textgreater \ 7$ . We will explore the different types of compound inequalities and provide a step-by-step guide on how to solve them.

Understanding Absolute Value Inequalities

Before we dive into solving compound inequalities, it's essential to understand absolute value inequalities. Absolute value inequalities involve the absolute value of an expression, which is the distance of the expression from zero on the number line. The absolute value of a number $a$ is denoted by $|a|$ and is defined as:

|a| = \begin{cases} a, & \text{if } a \geq 0 \\ -a, & \text{if } a < 0 \end{cases}

For example, the absolute value of $3x + 2$ is denoted by $|3x + 2|$ .

Solving Absolute Value Inequalities

To solve absolute value inequalities, we need to consider two cases:

Case 1: $3x + 2 \geq 0$
Case 2: $3x + 2 < 0$

For Case 1, we have:

3x + 2 \geq 0 \Rightarrow 3x \geq -2 \Rightarrow x \geq -\frac{2}{3}

For Case 2, we have:

3x + 2 < 0 \Rightarrow 3x < -2 \Rightarrow x < -\frac{2}{3}

Solving the Inequality $|3x + 2| \ \textgreater \ 7$

Now that we have a good understanding of absolute value inequalities, let's solve the inequality $|3x + 2| \ \textgreater \ 7$ . We will use the two cases we defined earlier.

Case 1: $3x + 2 \geq 0$

In this case, we have:

3x + 2 \geq 7 \Rightarrow 3x \geq 5 \Rightarrow x \geq \frac{5}{3}

Case 2: $3x + 2 < 0$

In this case, we have:

-(3x + 2) > 7 \Rightarrow -3x - 2 > 7 \Rightarrow -3x > 9 \Rightarrow x < -3

Writing the Compound Inequality

Now that we have solved the inequality $|3x + 2| \ \textgreater \ 7$ , we can write the compound inequality as:

x \in \left(-\infty, -3\right) \cup \left(\frac{5}{3}, \infty\right)

Conclusion

In this article, we have solved the compound inequality $|3x + 2| \ \textgreater \ 7$ . We have used the two cases we defined earlier to solve the inequality and have written the compound inequality as:

x \in \left(-\infty, -3\right) \cup \left(\frac{5}{3}, \infty\right)

We hope this article has provided a clear and concise guide on how to solve compound inequalities.

Frequently Asked Questions

Q: What is a compound inequality?

A: A compound inequality is an inequality that involves multiple inequalities joined by logical operators such as "and" or "or".

Q: How do I solve a compound inequality?

A: To solve a compound inequality, you need to consider multiple cases and solve each case separately.

Q: What is the difference between a compound inequality and a single inequality?

A: A compound inequality involves multiple inequalities joined by logical operators, while a single inequality involves a single inequality.

Q: Can I use a calculator to solve a compound inequality?

A: Yes, you can use a calculator to solve a compound inequality, but it's always a good idea to check your work by hand.

Final Answer

The final answer is:

x \in \left(-\infty, -3\right) \cup \left(\frac{5}{3}, \infty\right)$$<br/> # Solving Compound Inequalities: A Q&A Guide ===================================================== ## Introduction --------------- In our previous article, we discussed how to solve compound inequalities, specifically the inequality $|3x + 2| \ \textgreater \ 7$. We provided a step-by-step guide on how to solve compound inequalities and wrote the compound inequality as: $$x \in \left(-\infty, -3\right) \cup \left(\frac{5}{3}, \infty\right)

In this article, we will provide a Q&A guide on solving compound inequalities. We will answer some of the most frequently asked questions about compound inequalities and provide additional tips and resources for solving them.

Q&A

Q: What is a compound inequality?

A: A compound inequality is an inequality that involves multiple inequalities joined by logical operators such as "and" or "or".

Q: How do I solve a compound inequality?

A: To solve a compound inequality, you need to consider multiple cases and solve each case separately. You can use the following steps to solve a compound inequality:

Identify the logical operator: Determine whether the compound inequality is joined by "and" or "or".
Solve each inequality separately: Solve each inequality in the compound inequality separately.
Combine the solutions: Combine the solutions to each inequality to get the final solution.

Q: What is the difference between a compound inequality and a single inequality?

A: A compound inequality involves multiple inequalities joined by logical operators, while a single inequality involves a single inequality.

Q: Can I use a calculator to solve a compound inequality?

A: Yes, you can use a calculator to solve a compound inequality, but it's always a good idea to check your work by hand.

Q: How do I write a compound inequality in interval notation?

A: To write a compound inequality in interval notation, you need to use the following format:

x \in \left(a, b\right) \cup \left(c, d\right)

where $a$ , $b$ , $c$ , and $d$ are the endpoints of the intervals.

Q: Can I have multiple compound inequalities in a single problem?

A: Yes, you can have multiple compound inequalities in a single problem. You need to solve each compound inequality separately and then combine the solutions.

Tips and Resources

Tips for Solving Compound Inequalities

Read the problem carefully: Make sure you understand what the problem is asking for.
Identify the logical operator: Determine whether the compound inequality is joined by "and" or "or".
Solve each inequality separately: Solve each inequality in the compound inequality separately.
Combine the solutions: Combine the solutions to each inequality to get the final solution.

Resources for Solving Compound Inequalities

Online tutorials: There are many online tutorials and videos that can help you learn how to solve compound inequalities.
Practice problems: Practice solving compound inequalities with sample problems.
Math textbooks: Math textbooks often have sections on solving compound inequalities.

Conclusion

In this article, we have provided a Q&A guide on solving compound inequalities. We have answered some of the most frequently asked questions about compound inequalities and provided additional tips and resources for solving them. We hope this article has been helpful in your understanding of compound inequalities.

Frequently Asked Questions

Q: What is the difference between a compound inequality and a double inequality?

A: A compound inequality involves multiple inequalities joined by logical operators, while a double inequality involves two inequalities joined by a single logical operator.

Q: Can I use a graphing calculator to solve a compound inequality?

A: Yes, you can use a graphing calculator to solve a compound inequality, but it's always a good idea to check your work by hand.

Q: How do I solve a compound inequality with fractions?

A: To solve a compound inequality with fractions, you need to follow the same steps as solving a compound inequality with integers.

Q: Can I have a compound inequality with multiple variables?

A: Yes, you can have a compound inequality with multiple variables. You need to solve each inequality separately and then combine the solutions.

Final Answer

The final answer is:

x \in \left(-\infty, -3\right) \cup \left(\frac{5}{3}, \infty\right)