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

Question

Given:

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

Which of the following statements is necessarily true?

Step-by-Step Solution

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

This absolute value inequality breaks into two separate inequalities:

  • 5x - 2 < 3x + 8

  • 5x - 2 > -(3x + 8)

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

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

  • Add 2 2 to both sides: 2x < 10

  • Divide by 2 2 : x < 5

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

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

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

  • Add 2 2 to both sides: 8x > -6

  • Divide by 8 8 : x > -\frac{3}{4}

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

Answer

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