Math Problem Statement

reflection graph of y=3^x +2 with respect to line y=x

Solution

To reflect the graph of the function y=3x+2y = 3^x + 2 with respect to the line y=xy = x, we need to find the inverse of the function y=3x+2y = 3^x + 2, as reflecting over the line y=xy = x swaps the roles of xx and yy.

Steps:

  1. Start with the original equation:
    y=3x+2y = 3^x + 2

  2. Swap xx and yy to reflect over the line y=xy = x:
    x=3y+2x = 3^y + 2

  3. Solve for yy (which will now be the equation of the reflected function): x2=3yx - 2 = 3^y Take the natural logarithm of both sides: ln(x2)=ln(3y)\ln(x - 2) = \ln(3^y) Using logarithmic properties: ln(x2)=yln(3)\ln(x - 2) = y \ln(3) Solve for yy: y=ln(x2)ln(3)y = \frac{\ln(x - 2)}{\ln(3)}

Thus, the equation of the reflected graph is: y=ln(x2)ln(3)y = \frac{\ln(x - 2)}{\ln(3)}

Final Answer:

The reflection of y=3x+2y = 3^x + 2 with respect to the line y=xy = x is: y=ln(x2)ln(3)y = \frac{\ln(x - 2)}{\ln(3)}


Would you like a detailed explanation of any part of this process? Here are five related questions to expand your understanding:

  1. How do we find the inverse of exponential functions in general?
  2. What are the properties of logarithms that help solve such equations?
  3. How does reflecting a function over the line y=xy = x relate to finding its inverse?
  4. What does the graph of y=3x+2y = 3^x + 2 look like before and after reflection?
  5. How do vertical and horizontal shifts affect reflections over the line y=xy = x?

Tip: Reflecting over the line y=xy = x is the same as finding the inverse of a function. Always remember to swap xx and yy and then solve for yy.

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Math Problem Analysis

Mathematical Concepts

Exponential Functions
Logarithmic Functions
Graph Transformations
Inverse Functions

Formulas

y = 3^x + 2
y = (ln(x - 2)) / ln(3)

Theorems

Inverse Function Theorem
Logarithmic Properties

Suitable Grade Level

Grades 10-12