Math Problem Statement

Consider solving the absolute value inequality |x - 2| ≥ 3. Once we solve the inequalities, which graph shows the correct solution?

Solution

Let's begin by solving the absolute value inequality:

x23|x - 2| \geq 3

Step 1: Break down the absolute value inequality into two cases.

  1. Case 1: x23x - 2 \geq 3 x5x \geq 5

  2. Case 2: x23x - 2 \leq -3 x1x \leq -1

So, the solution to the inequality x23|x - 2| \geq 3 is x5x \geq 5 or x1x \leq -1.

Step 2: Logical operator for solutions

Since the absolute value represents a distance, we are considering the numbers whose distance from 2 is greater than or equal to 3. The word "or" is key here because we are looking for values either on the left or right of the critical points, not in between.

So, the correct choice in part A would be: 2. "We should be thinking that solutions are any xx-values that are solutions for either of our inequalities, i.e., we should be thinking 'OR'."

Step 3: Graphing the solution

Now, let's examine part B. The solution x5x \geq 5 or x1x \leq -1 will be a graph with shaded regions extending left from 1-1 and right from 55, including 1-1 and 55 as the boundary points. Looking at the graph options:

  • Option 1 shows x1x \leq -1 and x5x \geq 5, with filled circles at 1-1 and 5, indicating that these values are included in the solution. This is the correct graph.

Thus, for part B, the correct answer is 1.


Let me know if you need further clarification on any of the steps.

Follow-up questions:

  1. What happens if the inequality had been x2<3|x - 2| < 3?
  2. How does the solution change if the inequality sign is \leq instead of \geq?
  3. What is the reasoning behind splitting the absolute value into two inequalities?
  4. How would the graph change if the inequality was strict (e.g., >> or <<)?
  5. Can you explain why the word "OR" is used instead of "AND" in this situation?

Tip: When solving absolute value inequalities, always remember that AB|A| \geq B translates to ABA \geq B or ABA \leq -B.

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Math Problem Analysis

Mathematical Concepts

Absolute Value
Inequalities
Algebra

Formulas

|x - a| ≥ b translates to x ≥ a + b or x ≤ a - b

Theorems

Properties of Absolute Value Inequalities

Suitable Grade Level

Grades 9-10