Math Problem Statement

Express the given function h as a composition of two functions f and g so that h(x) = (f ∘ g)(x). h(x) = 1/(8x-8)

Solution

To solve this problem, we need to express the function h(x)=18x8h(x) = \frac{1}{8x - 8} as a composition of two functions f(x)f(x) and g(x)g(x) such that:

h(x)=(fg)(x)=f(g(x))h(x) = (f \circ g)(x) = f(g(x))

This means we need to find two functions ff and gg where:

  1. g(x)g(x) is some function that transforms xx into an intermediate expression.
  2. f(x)f(x) takes the result of g(x)g(x) and produces the final expression h(x)=18x8h(x) = \frac{1}{8x - 8}.

Analyzing the Function Composition

Given h(x)=18x8h(x) = \frac{1}{8x - 8}, let's identify possible forms of f(x)f(x) and g(x)g(x):

  1. Consider the expression inside the denominator: 8x88x - 8. Let's try setting g(x)=8x8g(x) = 8x - 8. Then, g(x)g(x) simplifies the denominator of h(x)h(x) directly.

  2. With g(x)=8x8g(x) = 8x - 8, we have g(x)g(x) producing the expression 8x88x - 8. For h(x)=18x8h(x) = \frac{1}{8x - 8}, we want:

    f(g(x))=f(8x8)=18x8f(g(x)) = f(8x - 8) = \frac{1}{8x - 8}

    This suggests f(u)=1uf(u) = \frac{1}{u} where u=g(x)u = g(x).

Identifying the Correct Answer

Based on the options provided, we find:

  • f(x)=1xf(x) = \frac{1}{x}, g(x)=8x8g(x) = 8x - 8 matches our decomposition.

Conclusion

The correct answer is:

f(x)=1x,g(x)=8x8\boxed{f(x) = \frac{1}{x}, \, g(x) = 8x - 8}

This corresponds to the second option in the provided choices.

Would you like more details or have any questions? Here are some related questions to explore:

  1. How does function composition work mathematically?
  2. What are other examples of functions that can be decomposed into compositions?
  3. Why does selecting the correct g(x)g(x) simplify finding f(x)f(x)?
  4. How can we apply function composition to solve real-world problems?
  5. What are common patterns for identifying function compositions?

Tip: When decomposing functions, focus on finding an inner function that simplifies the structure of the outer function.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Function Composition
Algebra
Rational Functions

Formulas

h(x) = f(g(x))
h(x) = 1/(8x-8)

Theorems

Function Composition Theorem

Suitable Grade Level

Grades 9-11