Math Problem Statement

Given the functions f(x) = 2x - 4 and g(x) = 4x^2 + 3, find (g ∘ f)(2).

Solution

To solve (gf)(2)(g \circ f)(2), we first break it into steps:

Step 1: Understand the composite function

The composite function (gf)(x)(g \circ f)(x) means g(f(x))g(f(x)). This involves finding f(x)f(x) first, then substituting it into g(x)g(x).

Step 2: Find f(2)f(2)

The given f(x)=2x4f(x) = 2x - 4: f(2)=2(2)4=44=0f(2) = 2(2) - 4 = 4 - 4 = 0

Step 3: Find g(f(2))=g(0)g(f(2)) = g(0)

The given g(x)=4x2+3g(x) = 4x^2 + 3: g(0)=4(0)2+3=0+3=3g(0) = 4(0)^2 + 3 = 0 + 3 = 3

Final Answer:

(gf)(2)=3(g \circ f)(2) = 3

Would you like additional explanation or further questions related to this problem?

Related Questions:

  1. What is the general form of (gf)(x)(g \circ f)(x) for these specific functions?
  2. How do you find (fg)(x)(f \circ g)(x) and compare it to (gf)(x)(g \circ f)(x)?
  3. What happens if g(x)g(x) is replaced with g(x)=x32x+1g(x) = x^3 - 2x + 1?
  4. Can the composite function g(f(x))g(f(x)) ever equal zero? If so, for what values of xx?
  5. How does the domain of f(x)f(x) and g(x)g(x) influence the composite function?

Tip:

Always simplify and check the intermediate values when dealing with composite functions to avoid calculation errors.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Function composition
Substitution
Polynomial functions

Formulas

(g ∘ f)(x) = g(f(x))

Theorems

-

Suitable Grade Level

Grades 9-11