Math Problem Statement

For the function f(x) = (5x - 7) / (5x - 9), find f^(-1)(x).

Solution

We are given the function f(x)=5x75x9f(x) = \frac{5x - 7}{5x - 9}, and we are tasked with finding the inverse of this function, f1(x)f^{-1}(x).

Steps to find the inverse:

  1. Replace f(x)f(x) with yy: y=5x75x9y = \frac{5x - 7}{5x - 9}

  2. Swap xx and yy: x=5y75y9x = \frac{5y - 7}{5y - 9}

  3. Solve for yy: Multiply both sides by 5y95y - 9 to eliminate the denominator: x(5y9)=5y7x(5y - 9) = 5y - 7 Expand both sides: 5xy9x=5y75xy - 9x = 5y - 7 Get all terms involving yy on one side and other terms on the opposite side: 5xy5y=9x75xy - 5y = 9x - 7 Factor out yy on the left-hand side: y(5x5)=9x7y(5x - 5) = 9x - 7 Solve for yy: y=9x75x5y = \frac{9x - 7}{5x - 5}

Thus, the inverse function is: f1(x)=9x75x5f^{-1}(x) = \frac{9x - 7}{5x - 5}

Would you like a more detailed explanation of any steps?

Here are 5 related questions to explore:

  1. How do you determine if a function has an inverse?
  2. What is the graphical interpretation of finding the inverse of a function?
  3. Are there any restrictions on the domain or range of the given function f(x)f(x)?
  4. How would you verify that f(f1(x))=xf(f^{-1}(x)) = x?
  5. Can you find the inverse of a quadratic function using a similar process?

Tip: When solving for the inverse of a function, always make sure the original function is one-to-one (i.e., passes the horizontal line test).

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Inverse Function
Algebra
Rational Functions

Formulas

f(x) = (5x - 7) / (5x - 9)
Inverse formula derivation

Theorems

Inverse Function Theorem

Suitable Grade Level

Grades 10-12