Math Problem Statement

Complete set of values of x satisfying the inequality | |x - 1| - 5 | < 2x - 5.

Solution

The inequality provided is:

x15<2x5| |x - 1| - 5 | < 2x - 5

Let's break this down step by step.

Step 1: Solve the Inner Absolute Value

The expression inside the double absolute value is x1|x - 1|. To analyze this, we consider two cases:

  • Case 1: x10x - 1 \geq 0 so x1=x1|x - 1| = x - 1
  • Case 2: x1<0x - 1 < 0 so x1=(x1)=1x|x - 1| = -(x - 1) = 1 - x

We need to deal with both cases separately.

Case 1: x10x - 1 \geq 0 or x1x \geq 1

For x1x \geq 1, the expression simplifies to x1=x1|x - 1| = x - 1, so we have: x15=x15=x6| x - 1 | - 5 = x - 1 - 5 = x - 6 Now the inequality becomes: x6<2x5| x - 6 | < 2x - 5 We again apply the definition of absolute value:

  • Subcase 1.1: If x60x - 6 \geq 0, this simplifies to: x6<2x5x - 6 < 2x - 5 Solving this: x6<2x56+5<xx>1x - 6 < 2x - 5 \quad \Rightarrow \quad -6 + 5 < x \quad \Rightarrow \quad x > -1 Since this subcase applies when x6x \geq 6, we now have x>1x > -1 and x6x \geq 6, meaning x6x \geq 6.

  • Subcase 1.2: If x6<0x - 6 < 0, this simplifies to: (x6)<2x5x+6<2x5-(x - 6) < 2x - 5 \quad \Rightarrow \quad -x + 6 < 2x - 5 Solving this: 6+5<3xx>11/36 + 5 < 3x \quad \Rightarrow \quad x > 11/3 Since this applies for x<6x < 6, we get 11/3<x<611/3 < x < 6.

Thus, the solution for Case 1 is x>11/3x > 11/3.

Case 2: x1<0x - 1 < 0 or x<1x < 1

For x<1x < 1, we have x1=(x1)=1x|x - 1| = -(x - 1) = 1 - x. So the inequality becomes: 1x5<2x5| 1 - x - 5 | < 2x - 5 Simplifying: 1x5=x4=(x+4)=x+4| 1 - x - 5 | = | -x - 4 | = | -(x + 4) | = | x + 4 | Thus, the inequality is: x+4<2x5| x + 4 | < 2x - 5 Now we again have two subcases:

  • Subcase 2.1: x+40x + 4 \geq 0, so: x+4<2x54+5<xx>9x + 4 < 2x - 5 \quad \Rightarrow \quad 4 + 5 < x \quad \Rightarrow \quad x > 9 This is not possible as it contradicts the condition x<1x < 1.

  • Subcase 2.2: x+4<0x + 4 < 0, so: (x+4)<2x5x4<2x5-(x + 4) < 2x - 5 \quad \Rightarrow \quad -x - 4 < 2x - 5 Solving this: 4+5<3x1<3xx>1/3-4 + 5 < 3x \quad \Rightarrow \quad 1 < 3x \quad \Rightarrow \quad x > 1/3 However, this subcase requires x<4x < -4, which is not possible since x>1/3x > 1/3.

Thus, Case 2 doesn't give any valid solutions.

Final Answer:

The solution is x(11/3,)x \in (11/3, \infty), which corresponds to option (2) in the provided list.

Would you like more details or have any questions?

Here are five questions related to this concept:

  1. What is the definition of absolute value and how is it applied in inequalities?
  2. How do you handle cases when solving inequalities involving absolute values?
  3. What is the difference between solving single and double absolute value inequalities?
  4. How do we interpret the intersection of solutions from different cases?
  5. How can graphing inequalities help visualize the solution set?

Tip: When dealing with absolute value inequalities, always split them into cases based on the definition of absolute value to handle each possibility correctly.

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Math Problem Analysis

Mathematical Concepts

Absolute Value Inequalities
Algebra
Piecewise Functions

Formulas

Absolute value property: |a| = a if a ≥ 0, and |a| = -a if a < 0
Solving absolute value inequalities: |x| < a implies -a < x < a

Theorems

Absolute Value Definition
Solving Inequalities

Suitable Grade Level

Grades 9-12