Math Problem Statement

Inverse of f(x)= 5x-6/x-1

Solution

To find the inverse of the function f(x)=5x6x1f(x) = \frac{5x - 6}{x - 1}, we need to follow these steps:

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

y=5x6x1y = \frac{5x - 6}{x - 1}

Step 2: Swap xx and yy, then solve for yy.

x=5y6y1x = \frac{5y - 6}{y - 1}

Step 3: Multiply both sides by y1y - 1 to eliminate the denominator.

x(y1)=5y6x(y - 1) = 5y - 6 xyx=5y6xy - x = 5y - 6

Step 4: Group all terms with yy on one side.

xy5y=x6xy - 5y = x - 6

Step 5: Factor out yy on the left-hand side.

y(x5)=x6y(x - 5) = x - 6

Step 6: Solve for yy.

y=x6x5y = \frac{x - 6}{x - 5}

Thus, the inverse of f(x)f(x) is: f1(x)=x6x5f^{-1}(x) = \frac{x - 6}{x - 5}

Would you like more details or have any questions?

Here are some related questions:

  1. How do you verify if two functions are inverses of each other?
  2. What are the key characteristics of inverse functions?
  3. How do horizontal line tests help in finding inverses?
  4. Can all rational functions have inverses?
  5. What happens to domain and range when finding an inverse?

Tip: Always check if the original function passes the horizontal line test to ensure it has an inverse.

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Math Problem Analysis

Mathematical Concepts

Algebra
Inverse Functions
Rational Functions

Formulas

y = (5x - 6) / (x - 1)
f^{-1}(x) = (x - 6) / (x - 5)

Theorems

Inverse function theorem

Suitable Grade Level

Grades 10-12