Math Problem Statement

Match the given functions with their inverses from the list.

Solution

In the image, you're working on matching functions with their inverses. To find the inverse of a function f(x)f(x), we typically swap xx and yy in the equation for f(x)f(x), and solve for yy, which becomes the inverse function f1(x)f^{-1}(x).

Let's start by analyzing one example and follow this process:

  1. Consider f(x)=2x1x+2f(x) = \frac{2x - 1}{x + 2}:
    • First, rewrite this as y=2x1x+2y = \frac{2x - 1}{x + 2}.
    • Swap xx and yy: x=2y1y+2x = \frac{2y - 1}{y + 2}.
    • Now solve for yy:
      • Multiply both sides by (y+2)(y + 2): x(y+2)=2y1x(y + 2) = 2y - 1.
      • Distribute xx: xy+2x=2y1xy + 2x = 2y - 1.
      • Get all terms involving yy on one side: xy2y=12xxy - 2y = -1 - 2x.
      • Factor out yy: y(x2)=12xy(x - 2) = -1 - 2x.
      • Solve for yy: y=12xx2y = \frac{-1 - 2x}{x - 2}.

So, the inverse of f(x)=2x1x+2f(x) = \frac{2x - 1}{x + 2} is f1(x)=12xx2f^{-1}(x) = \frac{-1 - 2x}{x - 2}.

Now, using this approach, you can match the rest of the functions with their inverses by following similar steps.

Would you like a detailed solution for each pair of functions? Feel free to ask!


Here are five questions to help reinforce this topic:

  1. What are the key steps for finding the inverse of a rational function?
  2. How can you verify that two functions are inverses of each other?
  3. Why do we switch xx and yy when finding the inverse of a function?
  4. What are common mistakes to avoid when finding inverses of more complex functions?
  5. How do you determine the domain and range of an inverse function?

Tip: When solving for the inverse, make sure to carefully handle any terms that involve both xx and yy on the same side of the equation!

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Inverse functions
Rational functions
Algebra

Formulas

If f(x) = (2x - 1) / (x + 2), then the inverse f^{-1}(x) = (-1 - 2x) / (x - 2)

Theorems

Inverse Function Theorem: f(f^{-1}(x)) = x and f^{-1}(f(x)) = x

Suitable Grade Level

Grades 9-12