Math Problem Statement

Which statements are true about the solutions to the equation f(x)=g(x), where f(x)=|2x–1| and g(x)= x

4 ? Select all that apply.

Questions

Solution

Let's analyze the equation f(x)=g(x)f(x) = g(x), where:

  • f(x)=2x1f(x) = |2x - 1|
  • g(x)=x4g(x) = \frac{x}{4}

We are tasked with solving the equation:

2x1=x4|2x - 1| = \frac{x}{4}

Step 1: Solve for xx

The absolute value equation 2x1=x4|2x - 1| = \frac{x}{4} can be rewritten as two separate cases:

Case 1: 2x1=x42x - 1 = \frac{x}{4} Multiply both sides by 4 to eliminate the denominator: 4(2x1)=x4(2x - 1) = x 8x4=x8x - 4 = x Now, solve for xx: 8xx=48x - x = 4 7x=47x = 4 x=47x = \frac{4}{7}

Case 2: (2x1)=x4-(2x - 1) = \frac{x}{4} Multiply both sides by 4: 4((2x1))=x4(-(2x - 1)) = x 8x+4=x-8x + 4 = x Now, solve for xx: 8xx=4-8x - x = -4 9x=4-9x = -4 x=49x = \frac{4}{9}

Step 2: Verify the Solutions

For x=47x = \frac{4}{7}:

  • f(x)=2(47)1=871=17f(x) = |2(\frac{4}{7}) - 1| = | \frac{8}{7} - 1| = \frac{1}{7}
  • g(x)=474=428=17g(x) = \frac{\frac{4}{7}}{4} = \frac{4}{28} = \frac{1}{7}

Both sides are equal, so x=47x = \frac{4}{7} is a solution.

For x=49x = \frac{4}{9}:

  • f(x)=2(49)1=891=19f(x) = |2(\frac{4}{9}) - 1| = | \frac{8}{9} - 1| = \frac{1}{9}
  • g(x)=494=436=19g(x) = \frac{\frac{4}{9}}{4} = \frac{4}{36} = \frac{1}{9}

Both sides are equal, so x=49x = \frac{4}{9} is also a solution.

Conclusion

The solutions to the equation are x=47x = \frac{4}{7} and x=49x = \frac{4}{9}.


Would you like more details about any of the steps or need further clarification?

Here are some related questions for you:

  1. How would you solve an absolute value equation involving a linear function on one side and a quadratic on the other?
  2. What does it mean for a function to have absolute value, and how does it affect the solutions?
  3. How can we graph 2x1|2x - 1| and x4\frac{x}{4} to visually interpret the solutions?
  4. What are the different types of equations that can be solved using absolute value functions?
  5. How would you solve for intersections of other types of functions (e.g., polynomial vs. rational functions)?

Tip: Always check for extraneous solutions when solving equations with absolute values, as some cases may produce values that don't satisfy the original equation.

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Math Problem Analysis

Mathematical Concepts

Absolute Value Equations
Linear Equations
Algebra

Formulas

|2x - 1| = x / 4

Theorems

Absolute Value Properties
Solving Linear Equations

Suitable Grade Level

Grades 9-11