Math Problem Statement

What positive value of x makes the equation ∣8−2x∣=16 true?

Solution

To solve the equation 82x=16|8 - 2x| = 16, we need to remove the absolute value by considering the two possible cases:

Case 1: Positive expression

82x=168 - 2x = 16 Solving for xx: 82x=16    2x=168    2x=8    x=82=48 - 2x = 16 \implies -2x = 16 - 8 \implies -2x = 8 \implies x = \frac{8}{-2} = -4 This is a solution, but we need the positive value of xx, so this one is not valid.

Case 2: Negative expression

82x=168 - 2x = -16 Solving for xx: 82x=16    2x=168    2x=24    x=242=128 - 2x = -16 \implies -2x = -16 - 8 \implies -2x = -24 \implies x = \frac{-24}{-2} = 12 This gives us x=12x = 12, which is a positive value.

Final Answer:

The positive value of xx that satisfies the equation is x=12x = 12.

Would you like more details or have any questions? Here are 5 related questions you can try:

  1. Solve 3x5=10|3x - 5| = 10 for xx.
  2. Find xx such that 2x+7=13|2x + 7| = 13.
  3. Solve 5x=9|5 - x| = 9 and identify the positive solution.
  4. How do you solve x+3=7|x + 3| = 7?
  5. What is the solution to 4x8=20|4x - 8| = 20?

Tip: When solving absolute value equations, always remember to split them into two cases: one for the positive and one for the negative.

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Math Problem Analysis

Mathematical Concepts

Algebra
Absolute Value Equations

Formulas

|A| = B implies A = B or A = -B

Theorems

Properties of Absolute Value

Suitable Grade Level

Grades 7-9