Math Problem Statement

Given that f ( x )

4 x 2 − 5 x − 2 and g ( x )

x + h :

Determine the rule for the composite function g ( g ( x ) ) .

g ( g ( x ) )

Determine the rule for the composite function g ( f ( x ) ) .

g ( f ( x ) )

Determine the rule for the composite function f ( g ( x ) ) .

f ( g ( x ) )

Solution

Given the functions:

\quad \text{and} \quad g(x) = x + h$$ Let's determine the rules for the composite functions: ### 1. Composite Function: $$g(g(x))$$ We know that $$g(x) = x + h$$. To find $$g(g(x))$$, substitute $$g(x)$$ into $$g$$ again: $$g(g(x)) = g(x + h) = (x + h) + h = x + 2h$$ Thus, the rule for $$g(g(x))$$ is: $$g(g(x)) = x + 2h$$ ### 2. Composite Function: $$g(f(x))$$ To find $$g(f(x))$$, substitute $$f(x) = 4x^2 - 5x - 2$$ into $$g$$: $$g(f(x)) = g(4x^2 - 5x - 2) = (4x^2 - 5x - 2) + h = 4x^2 - 5x - 2 + h$$ Thus, the rule for $$g(f(x))$$ is: $$g(f(x)) = 4x^2 - 5x - 2 + h$$ ### 3. Composite Function: $$f(g(x))$$ To find $$f(g(x))$$, substitute $$g(x) = x + h$$ into $$f$$: $$f(g(x)) = f(x + h) = 4(x + h)^2 - 5(x + h) - 2$$ First, expand the terms: $$f(g(x)) = 4(x^2 + 2xh + h^2) - 5(x + h) - 2$$ Simplifying: $$f(g(x)) = 4x^2 + 8xh + 4h^2 - 5x - 5h - 2$$ Thus, the rule for $$f(g(x))$$ is: $$f(g(x)) = 4x^2 + 8xh + 4h^2 - 5x - 5h - 2$$ --- Would you like further details or clarifications? Here are 5 related questions to explore: 1. How would the composite functions change if $$h = 0$$? 2. What is the domain of the composite function $$f(g(x))$$? 3. How would you graph the function $$f(g(x))$$? 4. How does the behavior of $$g(g(x))$$ depend on the value of $$h$$? 5. What is the inverse of the function $$g(x) = x + h$$? **Tip:** Always expand composite functions step by step and simplify carefully to avoid mistakes in handling powers and coefficients.

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Math Problem Analysis

Mathematical Concepts

Algebra
Composite Functions
Quadratic Functions

Formulas

f(x) = 4x^2 - 5x - 2
g(x) = x + h
g(g(x)) = x + 2h
g(f(x)) = 4x^2 - 5x - 2 + h
f(g(x)) = 4x^2 + 8xh + 4h^2 - 5x - 5h - 2

Theorems

Function Composition

Suitable Grade Level

Grades 10-12