Use algebra to find the inverse of the function f(x) = 2x°+3 The inverse function is f(x) =

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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**Finding the Inverse Function Using Algebra**

To find the inverse of the function \( f(x) = 2x^5 + 3 \) using algebra, we need to solve for \( x \) in terms of \( y \) and then express it as \( f^{-1}(x) \). 

### Step-by-Step Process

1. **Start with the original function:**
   \[ y = 2x^5 + 3 \]

2. **Swap \( x \) and \( y \):**
   \[ x = 2y^5 + 3 \]

3. **Isolate \( y \):**
   a. Subtract 3 from both sides:
      \[ x - 3 = 2y^5 \]
      
   b. Divide both sides by 2:
      \[ \frac{x - 3}{2} = y^5 \]
      
   c. Take the fifth root of both sides:
      \[ y = \sqrt[5]{\frac{x - 3}{2}} \]

4. **Write the inverse function:**
   \[ f^{-1}(x) = \sqrt[5]{\frac{x - 3}{2}} \]

Now, let's complete the given information:

The inverse function is:
\[ f^{-1}(x) = \sqrt[5]{\frac{x - 3}{2}} \]

This method provides a systematic approach to finding the inverse of a function. Remember, to confirm the correctness of an inverse function, you can check if \( f(f^{-1}(x)) = x \) and \( f^{-1}(f(x)) = x \).
Transcribed Image Text:**Finding the Inverse Function Using Algebra** To find the inverse of the function \( f(x) = 2x^5 + 3 \) using algebra, we need to solve for \( x \) in terms of \( y \) and then express it as \( f^{-1}(x) \). ### Step-by-Step Process 1. **Start with the original function:** \[ y = 2x^5 + 3 \] 2. **Swap \( x \) and \( y \):** \[ x = 2y^5 + 3 \] 3. **Isolate \( y \):** a. Subtract 3 from both sides: \[ x - 3 = 2y^5 \] b. Divide both sides by 2: \[ \frac{x - 3}{2} = y^5 \] c. Take the fifth root of both sides: \[ y = \sqrt[5]{\frac{x - 3}{2}} \] 4. **Write the inverse function:** \[ f^{-1}(x) = \sqrt[5]{\frac{x - 3}{2}} \] Now, let's complete the given information: The inverse function is: \[ f^{-1}(x) = \sqrt[5]{\frac{x - 3}{2}} \] This method provides a systematic approach to finding the inverse of a function. Remember, to confirm the correctness of an inverse function, you can check if \( f(f^{-1}(x)) = x \) and \( f^{-1}(f(x)) = x \).
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