Math Problem Statement

Persamaan bayangan dari fungsi f(x) = (2x-1)/(x-2), x ≠ 2 jika direfleksikan terhadap garis y = 3 adalah ...

Solution

The question asks for the equation of the reflection of the function f(x)=2x1x2f(x) = \frac{2x - 1}{x - 2}, where x2x \neq 2, over the line y=3y = 3.

Step-by-Step Solution:

  1. Find the reflection formula: To reflect a function f(x)f(x) across the line y=cy = c, we use the formula: ynew=2cf(x)y_{\text{new}} = 2c - f(x) where cc is the value of the line over which we are reflecting, and in this case, c=3c = 3.

  2. Apply the reflection: The function is reflected across y=3y = 3, so: ynew=2(3)f(x)y_{\text{new}} = 2(3) - f(x) ynew=6(2x1x2)y_{\text{new}} = 6 - \left( \frac{2x - 1}{x - 2} \right)

  3. Simplify the expression: Subtract f(x)f(x) from 6: ynew=62x1x2y_{\text{new}} = 6 - \frac{2x - 1}{x - 2} To simplify further, we can rewrite this expression as: ynew=6(x2)(2x1)x2y_{\text{new}} = \frac{6(x - 2) - (2x - 1)}{x - 2} Simplify the numerator: 6(x2)=6x126(x - 2) = 6x - 12 So: ynew=6x12(2x1)x2y_{\text{new}} = \frac{6x - 12 - (2x - 1)}{x - 2} ynew=6x122x+1x2y_{\text{new}} = \frac{6x - 12 - 2x + 1}{x - 2} ynew=4x11x2y_{\text{new}} = \frac{4x - 11}{x - 2}

Thus, the equation of the reflected function is: y=4x11x2y = \frac{4x - 11}{x - 2}

Would you like more details or have any other questions? Here are some related problems to expand your understanding:

  1. How do you reflect a function over lines other than y=cy = c?
  2. What happens when you reflect a function over the x-axis?
  3. How would you solve this problem if the reflection were over a different line, such as y=1y = 1?
  4. How can you graph the original function and its reflection?
  5. What is the domain and range of the original function and its reflection?

Tip: When reflecting functions over lines, visualize the change geometrically to better understand the effect on the graph.

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Math Problem Analysis

Mathematical Concepts

Reflection of functions
Algebraic functions

Formulas

Reflection formula: y_new = 2c - f(x) where c is the line of reflection
Function simplification

Theorems

Function reflection over horizontal lines

Suitable Grade Level

Grades 10-12