Solve the Absolute Value Inequality: |2x - 4| < 8

Question

Given:

\left|2x-4\right|<8

Which of the following statements is necessarily true?

Video Solution

Step-by-Step Solution

To solve the absolute value inequality 2x4<8 |2x - 4| < 8 , we begin by removing the absolute value expression. This gives us a compound inequality:

8<2x4<8-8 < 2x - 4 < 8.

We will solve this compound inequality by handling each part separately:

  • Start with the left inequality: 8<2x4-8 < 2x - 4.
    • Add 4 to both sides to isolate the term with x x : 8+4<2x-8 + 4 < 2x.
    • Simplify: 4<2x-4 < 2x.
    • Finally, divide both sides by 2: 2<x-2 < x.
  • Now, solve the right inequality: 2x4<82x - 4 < 8.
    • Add 4 to both sides to isolate the term with x x : 2x4+4<8+42x - 4 + 4 < 8 + 4.
    • Simplify: 2x<122x < 12.
    • Finally, divide both sides by 2: x<6x < 6.

Combining the two solutions from the parts, we find:

2<x<6-2 < x < 6.

The solution indicates that x x must be greater than -2 and less than 6. This form matches answer choice 4. Therefore, the correct solution is:

2<x<6-2 < x < 6.

Answer

-2 < x < 6