Math Problem Statement

How many solutions exist for 2|x − 1| = 8?

Solution

We are given the equation:

2x1=82|x - 1| = 8

Step 1: Isolate the absolute value expression

First, divide both sides by 2 to isolate the absolute value expression:

x1=82|x - 1| = \frac{8}{2}

x1=4|x - 1| = 4

Step 2: Solve for the two cases

The absolute value equation x1=4|x - 1| = 4 means that x1x - 1 can either be 4 or -4. Therefore, we have two cases to solve:

Case 1: x1=4x - 1 = 4

Solve for xx:

x=4+1=5x = 4 + 1 = 5

Case 2: x1=4x - 1 = -4

Solve for xx:

x=4+1=3x = -4 + 1 = -3

Step 3: Conclusion

The two solutions to the equation 2x1=82|x - 1| = 8 are:

x=5andx=3x = 5 \quad \text{and} \quad x = -3

Thus, there are 2 solutions to the equation.


Would you like further details or have any questions? Here are some related questions to explore:

  1. How would the solutions change if the equation were 3x2=123|x - 2| = 12?
  2. What is the general method to solve absolute value equations of the form axb=ca|x - b| = c?
  3. How can you solve absolute value inequalities such as x35|x - 3| \leq 5?
  4. What happens if the absolute value equation includes a negative sign inside, like x1=4|x - 1| = -4?
  5. Can absolute value equations have no solutions? If so, when?

Tip: When solving absolute value equations, always consider both the positive and negative cases for the expression inside the absolute value.

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Math Problem Analysis

Mathematical Concepts

Absolute Value Equations
Linear Equations

Formulas

|x - a| = b implies x - a = b or x - a = -b

Theorems

Absolute Value Property

Suitable Grade Level

Grades 6-8