Math Problem Statement

Find the inverse of the function f (x) = 6x/ (x−5)

Solution

To find the inverse of the function f(x)=6xx5f(x) = \frac{6x}{x - 5}, follow these steps:

Step 1: Replace f(x)f(x) with yy

We start by rewriting the equation as: y=6xx5y = \frac{6x}{x - 5}

Step 2: Swap yy and xx

To find the inverse function, swap yy and xx: x=6yy5x = \frac{6y}{y - 5}

Step 3: Solve for yy

Now, solve this equation for yy. Start by multiplying both sides of the equation by y5y - 5 to eliminate the denominator: x(y5)=6yx(y - 5) = 6y Expand the left-hand side: xy5x=6yxy - 5x = 6y Move all terms involving yy to one side: xy6y=5xxy - 6y = 5x Factor out yy on the left-hand side: y(x6)=5xy(x - 6) = 5x Solve for yy: y=5xx6y = \frac{5x}{x - 6}

Step 4: Write the inverse function

The inverse function is: f1(x)=5xx6f^{-1}(x) = \frac{5x}{x - 6}

Final Answer:

f1(x)=5xx6f^{-1}(x) = \frac{5x}{x - 6}

Would you like to go over any details or have any questions?

Here are some related questions:

  1. How do you verify the inverse of a function?
  2. What are the domain and range of the inverse function?
  3. Can all functions have inverses? Why or why not?
  4. How would you graph the function and its inverse?
  5. What are the conditions for a function to be one-to-one?

Tip: To check if two functions are inverses, you can compose them: f(f1(x))=f1(f(x))=xf(f^{-1}(x)) = f^{-1}(f(x)) = x.

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Math Problem Analysis

Mathematical Concepts

Inverse Functions
Algebraic Manipulation

Formulas

Inverse function process: Swap variables and solve for y
f(x) = 6x / (x − 5) and f⁻¹(x) = 5x / (x − 6)

Theorems

Inverse Function Theorem

Suitable Grade Level

Grades 10-12