Math Problem Statement
true or false
∀x ∈ ℝ, IF |x + 2| < 5 AND |x - 1| < 3, THEN x < 1.
Solution
The problem asks to determine whether the given logical statement is true or false:
Step-by-Step Analysis:
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First Inequality:
- This absolute value inequality can be rewritten as: Subtracting 2 from all parts:
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Second Inequality:
- This absolute value inequality can be rewritten as: Adding 1 to all parts:
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Combined Inequalities:
- Now, we combine the two ranges:
- from the first inequality.
- from the second inequality.
- The intersection of these intervals is:
- Now, we combine the two ranges:
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The Conclusion:
- We now check whether holds for all values in the interval .
- Clearly, this is false for values in the interval , where is greater than or equal to 1.
Conclusion:
The statement is false because the conclusion does not hold for all values of in the range .
Would you like more details or have any questions?
Here are five related questions for practice:
- What is the solution set for ?
- How would the inequality change if the conclusion was ?
- Can you find a counterexample for this logical statement in a different domain (e.g., integers)?
- How does the solution change if the inequalities use "greater than or equal to" instead of strict inequalities?
- How would the problem change if we had ?
Tip: When solving absolute value inequalities, always consider splitting the absolute value into two separate inequalities to handle both the positive and negative cases.
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Math Problem Analysis
Mathematical Concepts
Algebra
Absolute Value Inequalities
Logical Statements
Formulas
|x + a| < b implies -b < x + a < b
|x - a| < b implies -b < x - a < b
Theorems
Logical implications in inequalities
Suitable Grade Level
Grades 10-12