Question
Which set of values in the soktion set of the equation \( |2 x-3|=7 \) ? 12,81 \( \{2,-5\} \) \( [-2,5] \) \( (-2,-5) \)
Ask by Chadwick Moreno. in the United States
Feb 03,2025
Real Tutor Solution
Tutor-Verified Answer
Answer
The correct solution set is {5, -2}.
Solution
Let's solve the equation \( |2x - 3| = 7 \) and determine the correct solution set from the provided options.
### Step 1: Understand the Absolute Value Equation
The absolute value equation \( |A| = B \) has two possible solutions:
1. \( A = B \)
2. \( A = -B \)
Applying this to your equation:
\[
|2x - 3| = 7
\]
This gives us two cases:
1. **Case 1: \( 2x - 3 = 7 \)**
\[
2x - 3 = 7 \\
2x = 10 \\
x = 5
\]
2. **Case 2: \( 2x - 3 = -7 \)**
\[
2x - 3 = -7 \\
2x = -4 \\
x = -2
\]
### Step 2: Solution Set
The solutions to the equation are:
\[
x = 5 \quad \text{and} \quad x = -2
\]
Therefore, the **solution set** is:
\[
\{5, -2\}
\]
### Step 3: Comparing with Provided Options
Let's review the provided options:
1. **12,81**
- These are individual numbers, not a set, and do not include the correct solutions.
2. **\( \{2, -5\} \)**
- This set is close in structure but **incorrect in values**.
3. **\( [-2,5] \)**
- This represents an interval from -2 to 5, including all real numbers between them. While it **includes the solutions**, it's not the precise solution set, which only contains two specific values.
4. **\( (-2, -5) \)**
- This interval is incorrectly ordered and does not represent the correct solutions.
### Final Conclusion
None of the provided options exactly match the correct solution set \( \{5, -2\} \). However, the closest option in structure is **\( \{2, -5\} \)**, but it contains incorrect values. It's possible there was a typographical error in either the equation or the options provided.
**Correct Solution Set:**
\[
\{5, -2\}
\]
Reviewed and approved by the UpStudy tutoring team
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Mind Expander
To solve the equation \( |2x - 3| = 7 \), we consider two cases based on the definition of absolute value: 1. \( 2x - 3 = 7 \) leads to \( 2x = 10 \) or \( x = 5 \). 2. \( 2x - 3 = -7 \) leads to \( 2x = -4 \) or \( x = -2 \). So, the solution set is \( \{5, -2\} \), which isn't one of the options listed. The provided values seem incorrect or contain a misunderstanding. In practice, absolute value equations often yield two solutions, reflecting the distance from zero on the number line; thus, it's crucial to handle both positive and negative scenarios.