Solve the Absolute Value Inequality: |5x - 2| < 3x + 8

Given:

5x2<3x+8 \left|5x - 2\right| < 3x + 8

Which of the following statements is necessarily true?

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1

Understand the problem

Given:

5x2<3x+8 \left|5x - 2\right| < 3x + 8

Which of the following statements is necessarily true?

2

Step-by-step solution

We start with the inequality: 5x2<3x+8 \left|5x - 2\right| < 3x + 8

This absolute value inequality breaks into two separate inequalities:

  • 5x2<3x+8 5x - 2 < 3x + 8

  • 5x2>(3x+8) 5x - 2 > -(3x + 8)

Solving the first inequality: 5x2<3x+8 5x - 2 < 3x + 8

  • Subtract 3x 3x from both sides: 2x2<8 2x - 2 < 8

  • Add 2 2 to both sides: 2x<10 2x < 10

  • Divide by 2 2 : x<5 x < 5

Solving the second inequality: 5x2>(3x+8) 5x - 2 > -(3x + 8)

  • Distribute the negative: 5x2>3x8 5x - 2 > -3x - 8

  • Add 3x 3x to both sides: 8x2>8 8x - 2 > -8

  • Add 2 2 to both sides: 8x>6 8x > -6

  • Divide by 8 8 : x>34 x > -\frac{3}{4}

The solution is the intersection: x<5 x < 5 and x>34 x > -\frac{3}{4} . Hence, 34<x<5 -\frac{3}{4} < x < 5 .

3

Final Answer

34<x<5 -\frac{3}{4} < x < 5

Practice Quiz

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Given:

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

Which of the following statements is necessarily true?

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