Math Problem Statement

If f(x) = 1 / (x - 5) and g(x) = 1 / x - 5, find f(g(x)).

Solution

To solve for f(g(x))f(g(x)), let's first clarify the functions given:

  1. f(x)=1x5f(x) = \frac{1}{x - 5}
  2. g(x)=1x5g(x) = \frac{1}{x} - 5

Step 1: Substitute g(x)g(x) into f(x)f(x)

Since we want f(g(x))f(g(x)), we substitute g(x)g(x) into ff: f(g(x))=f(1x5)f(g(x)) = f\left(\frac{1}{x} - 5\right)

Step 2: Substitute into f(x)=1x5f(x) = \frac{1}{x - 5}

Replace xx in f(x)f(x) with g(x)=1x5g(x) = \frac{1}{x} - 5: f(g(x))=1(1x5)5f(g(x)) = \frac{1}{\left(\frac{1}{x} - 5\right) - 5}

Step 3: Simplify the Expression

Now simplify the expression inside the denominator: f(g(x))=11x55f(g(x)) = \frac{1}{\frac{1}{x} - 5 - 5} =11x10= \frac{1}{\frac{1}{x} - 10}

To further simplify: f(g(x))=1110xx=x110xf(g(x)) = \frac{1}{\frac{1 - 10x}{x}} = \frac{x}{1 - 10x}

So, f(g(x))=x110xf(g(x)) = \frac{x}{1 - 10x}

Answer:

f(g(x))=x110xf(g(x)) = \frac{x}{1 - 10x}

Would you like more details on the simplification steps?


Here are some related questions to explore further:

  1. How would you calculate g(f(x))g(f(x)) instead of f(g(x))f(g(x))?
  2. What are the domains of f(x)f(x) and g(x)g(x), and how do they impact the domain of f(g(x))f(g(x))?
  3. How would you find f(f(x))f(f(x)) or g(g(x))g(g(x))?
  4. Can you determine the inverse functions for f(x)f(x) and g(x)g(x)?
  5. What happens to f(g(x))f(g(x)) as xx approaches certain values that make the function undefined?

Tip: When composing functions, always consider the domain restrictions that may affect the final result.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Function Composition
Algebraic Expressions
Rational Functions

Formulas

f(g(x)) = f(g(x)) = 1 / ((1/x) - 10) = x / (1 - 10x)

Theorems

Function Composition

Suitable Grade Level

Grades 10-12