Solve |3x - 2| ≥ 4: Absolute Value Inequality Challenge

Absolute Value Inequalities with "Or" Solutions

Given:

3x24 |3x - 2| \geq 4

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:

3x24 |3x - 2| \geq 4

Which of the following statements is necessarily true?

2

Step-by-step solution

To solve the inequality 3x24 |3x - 2| \geq 4 , we separate it into:

3x24 3x - 2 \geq 4 or 3x24 3x - 2 \leq -4 .

For 3x24 3x - 2 \geq 4 , add 2 to both sides:

3x6 3x \geq 6

Divide by 3:

x2 x \geq 2

For 3x24 3x - 2 \leq -4 , add 2 to both sides:

3x2 3x \leq -2

Divide by 3:

x23 x \leq -\frac{2}{3}

Therefore, the solution is x2 x \geq 2 or x23 x \leq -\frac{2}{3} .

3

Final Answer

x2 x \geq 2 or x23 x \leq -\frac{2}{3}

Key Points to Remember

Essential concepts to master this topic
  • Rule: |A| ≥ B splits into A ≥ B or A ≤ -B
  • Technique: For |3x - 2| ≥ 4, solve 3x - 2 ≥ 4 AND 3x - 2 ≤ -4
  • Check: Test x = 3: |3(3) - 2| = 7 ≥ 4 ✓

Common Mistakes

Avoid these frequent errors
  • Using 'and' instead of 'or' in the solution
    Don't connect the two parts with 'and' like x ≥ 2 AND x ≤ -2/3 = impossible solution! This creates a contradiction since no number can be both greater than 2 and less than -2/3. Always use 'or' because absolute value inequalities give union solutions.

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 does the inequality split into two separate cases?

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Because absolute value measures distance! When 3x24 |3x - 2| \geq 4 , it means the expression 3x - 2 is either 4 or more units to the right of zero, or 4 or more units to the left of zero.

How do I know when to use 'or' versus 'and'?

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For AB |A| \geq B , always use 'or' because solutions are on opposite sides of the number line. For AB |A| \leq B , use 'and' because solutions are between two values.

What if I get a negative number on the right side?

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If B is negative in AB |A| \geq B , then all real numbers are solutions! Absolute values are never negative, so they're always ≥ any negative number.

Can I solve this by graphing instead?

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Yes! Graph y=3x2 y = |3x - 2| and y=4 y = 4 . The solution includes all x-values where the absolute value graph is on or above the horizontal line y = 4.

Why is the answer not between the two boundary points?

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This is a ≥ inequality, not ≤! The solution includes values outside the boundary points x=23 x = -\frac{2}{3} and x=2 x = 2 , not between them.

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