Solve Double Absolute Value Inequality: |3c + 5| + |-c - 6| < -1

Absolute Value Inequalities with Impossible Conditions

Given:

3c+5+c6<1 |3c + 5| + |-c - 6| < -1

Which of the following statements is necessarily true?

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Step-by-step written solution

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1

Understand the problem

Given:

3c+5+c6<1 |3c + 5| + |-c - 6| < -1

Which of the following statements is necessarily true?

2

Step-by-step solution

The given inequality is: 3c+5+c6<1 |3c + 5| + |-c - 6| < -1 .

Combining absolute values with negative numbers results in an inequality that cannot be less than 1 -1 .

To show this, consider each term separately: both 3c+50|3c + 5| \ge 0 and c60|-c - 6| \ge 0 because absolute values cannot be negative.

Add these terms: 3c+5+c60|3c + 5| + |-c - 6| \ge 0. Clearly, this result cannot be less than -1.

Therefore, the condition <1< -1 cannot be satisfied for any c c .

Thus, the statement "No solution" is correct.

3

Final Answer

No solution

Key Points to Remember

Essential concepts to master this topic
  • Fundamental Rule: Sum of absolute values is always non-negative
  • Technique: Check if a+b0 |a| + |b| \ge 0 can satisfy given inequality
  • Check: When sum ≥ 0 but inequality requires < -1, no solution exists ✓

Common Mistakes

Avoid these frequent errors
  • Attempting to solve by finding critical points
    Don't break down 3c+5+c6<1 |3c + 5| + |-c - 6| < -1 into cases and solve each = wasted time on impossible problem! Since absolute values are never negative, their sum cannot be less than -1. Always check if the inequality is mathematically possible before solving.

Practice Quiz

Test your knowledge with interactive questions

Given:

\( \left|2x-1\right|>-10 \)

Which of the following statements is necessarily true?

FAQ

Everything you need to know about this question

Why can't absolute values be negative?

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By definition, absolute value measures distance from zero, which is never negative. So x0 |x| \ge 0 for any real number x.

What if one absolute value could be negative to cancel the other?

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Impossible! Both 3c+50 |3c + 5| \ge 0 and c60 |-c - 6| \ge 0 are always non-negative, so their sum is always ≥ 0.

How do I recognize when an inequality has no solution?

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Look for situations where you need a positive quantity to be negative. Examples: x2<5 x^2 < -5 , x<3 |x| < -3 , or sums of absolute values less than negative numbers.

Should I still try to solve it step by step?

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No need! Once you recognize that a+b0 |a| + |b| \ge 0 but the inequality requires < -1, you can immediately conclude no solution exists.

What's the difference between 'no solution' and 'all real numbers'?

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No solution: The inequality is impossible (like our problem). All real numbers: Every value works (like x0 |x| \ge 0 ).

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