Math Problem Statement

what is the formula of composition function

Solution

The composition of functions involves applying one function to the result of another function. If you have two functions, say f(x)f(x) and g(x)g(x), the composition of these two functions is written as:

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

This means that you first apply the function gg to the input xx, and then apply the function ff to the result of g(x)g(x).

Steps for Composing Functions:

  1. Start with an input xx.
  2. Apply g(x)g(x).
  3. Apply ff to the result of g(x)g(x), which gives f(g(x))f(g(x)).

Example:

Let f(x)=2x+1f(x) = 2x + 1 and g(x)=x2g(x) = x^2. The composition (fg)(x)(f \circ g)(x) is:

(fg)(x)=f(g(x))=f(x2)=2(x2)+1=2x2+1(f \circ g)(x) = f(g(x)) = f(x^2) = 2(x^2) + 1 = 2x^2 + 1

Would you like more examples or further explanation?

5 Related Questions:

  1. How do you compose three functions, say f(x)f(x), g(x)g(x), and h(x)h(x)?
  2. What is the difference between f(g(x))f(g(x)) and g(f(x))g(f(x))?
  3. Can all functions be composed with each other?
  4. How do you find the domain of a composite function?
  5. What is the inverse of a composite function?

Tip:

Always check the domain of both functions when composing, as the domain of the composition may be restricted based on the inner function.

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Math Problem Analysis

Mathematical Concepts

Function Composition
Algebra

Formulas

(f ∘ g)(x) = f(g(x))

Theorems

Composition of Functions

Suitable Grade Level

Grades 10-12