Math Problem Statement

Misalkan f dan g masing-masing menyatakan suatu fungsi. Fungsi komposisi dari g dengan f didefinisikan sebagai (g o f)(x) = f(g(x)), dengan x merupakan unsur di domain f dan f(x) merupakan unsur di domain g. Apakah pernyataan ini benar atau salah?

Solution

The question in the image asks whether the following statement is true or false:

"Let ff and gg each represent functions. The composition function of gg and ff is defined as (gf)(x)=f(g(x))(g \circ f)(x) = f(g(x)), where xx is an element in the domain of ff, and f(x)f(x) is an element in the domain of gg."

This statement is False, and here's why:

The correct definition of the composition of two functions gfg \circ f is (gf)(x)=g(f(x))(g \circ f)(x) = g(f(x)), not f(g(x))f(g(x)). Additionally, for the composition g(f(x))g(f(x)) to be valid:

  • xx must belong to the domain of ff,
  • f(x)f(x) must belong to the domain of gg.

Thus, the original statement reverses the order of the composition and is incorrect.

Let me know if you'd like further details or explanations!

Here are 5 questions related to this topic:

  1. What are the conditions for the composition of two functions to be defined?
  2. How can you determine the domain of a composite function?
  3. What is the difference between f(g(x))f(g(x)) and g(f(x))g(f(x))?
  4. Can a composite function exist if the range of the inner function does not overlap with the domain of the outer function?
  5. How do you evaluate a composite function given specific functions f(x)f(x) and g(x)g(x)?

Tip: Always ensure the correct order of function composition—(gf)(x)=g(f(x))(g \circ f)(x) = g(f(x))—when working with composite functions.

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Math Problem Analysis

Mathematical Concepts

Composite Functions
Domains and Ranges

Formulas

(g o f)(x) = g(f(x))

Theorems

Function Composition Theorem

Suitable Grade Level

Grades 9-12