Solve |d|-|13-8|+|3|<0: Multiple Absolute Value Inequality

Absolute Value Inequalities with Multiple Terms

Given:

d138+3<0 |d|-|13-8|+|3|<0

Which of the following statements is necessarily true?

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Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Given:

d138+3<0 |d|-|13-8|+|3|<0

Which of the following statements is necessarily true?

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Simplify the constants in the inequality.

  • Step 2: Rearrange the inequality into a solvable form.

  • Step 3: Analyze the resulting inequality to find the acceptable range of d d .

Now, let's work through each step:
Step 1: Calculate the absolute values:
- 138=5=5 |13 - 8| = |5| = 5
- 3=3 |3| = 3

So the inequality becomes:
d5+3<0 |d| - 5 + 3 < 0

Simplify the constants:
d2<0 |d| - 2 < 0

Step 2: Rearrange by isolating d |d| :
d<2 |d| < 2

Step 3: Solve d<2 |d| < 2 :
The expression d<2 |d| < 2 results in the inequality 2<d<2 -2 < d < 2 .

3

Final Answer

2<d<2 -2 < d < 2

Key Points to Remember

Essential concepts to master this topic
  • Simplification: Calculate all absolute values before solving the inequality
  • Technique: Isolate |d| first: |d| - 5 + 3 < 0 becomes |d| < 2
  • Check: Test d = 0: |0| - |5| + |3| = 0 - 5 + 3 = -2 < 0 ✓

Common Mistakes

Avoid these frequent errors
  • Trying to solve for d before simplifying absolute values
    Don't attempt to solve |d| - |13-8| + |3| < 0 without calculating |13-8| = 5 and |3| = 3 first = complex, confusing work! This makes the problem much harder and leads to errors. Always evaluate all known absolute values before isolating the variable.

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 do I need to solve |13-8| and |3| first?

+

These are constants that you can calculate immediately! 138=5=5 |13-8| = |5| = 5 and 3=3 |3| = 3 . Simplifying these makes your inequality much easier to work with.

How do I solve |d| < 2?

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The absolute value inequality d<2 |d| < 2 means the distance from d to zero is less than 2. This gives us 2<d<2 -2 < d < 2 .

What if I got |d| > 2 instead?

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Double-check your arithmetic! We have d5+3<0 |d| - 5 + 3 < 0 , which simplifies to d2<0 |d| - 2 < 0 , so d<2 |d| < 2 .

How can I verify my answer -2 < d < 2?

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Pick a test value like d = 0: 0138+3=05+3=2<0 |0| - |13-8| + |3| = 0 - 5 + 3 = -2 < 0 ✓. Try d = 3: 35+3=1>0 |3| - 5 + 3 = 1 > 0 ✗, confirming d = 3 is outside our solution.

Why isn't the answer -6 < d < 6?

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That would be the solution to d<6 |d| < 6 , not d<2 |d| < 2 . Always double-check your final simplified inequality before writing the solution!

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