Math Problem Statement

Given f(x), find g(x) and h(x) such that f(x)=g(h(x)) and neither g(x) nor h(x) is solely x.

f(x)=−2x3+4⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯√+2

Given f(x), find g(x) and h(x) such that f(x) = g(h(x)) and neither g(x) nor h(x) is solely x. f(x) = √(-2x^3 + 4) + 2

Solution

To find functions g(x)g(x) and h(x)h(x) such that f(x)=g(h(x))f(x) = g(h(x)) and neither g(x)g(x) nor h(x)h(x) is just xx, we need to analyze the given function:

f(x)=2x3+4+2f(x) = \sqrt{-2x^3 + 4} + 2

Step 1: Identify h(x)h(x)

We want to identify an inner function h(x)h(x) such that the expression inside the square root is represented by h(x)h(x). Let’s set: h(x)=2x3+4h(x) = -2x^3 + 4

Step 2: Identify g(x)g(x)

With h(x)=2x3+4h(x) = -2x^3 + 4, we can rewrite f(x)f(x) in terms of g(h(x))g(h(x)). Since f(x)=h(x)+2f(x) = \sqrt{h(x)} + 2, let’s define: g(x)=x+2g(x) = \sqrt{x} + 2

Verification

Now, substituting h(x)=2x3+4h(x) = -2x^3 + 4 into g(h(x))g(h(x)): g(h(x))=g(2x3+4)=2x3+4+2=f(x)g(h(x)) = g(-2x^3 + 4) = \sqrt{-2x^3 + 4} + 2 = f(x) This matches f(x)f(x), so the functions are correct.

Final Answer

g(x)=x+2g(x) = \sqrt{x} + 2 h(x)=2x3+4h(x) = -2x^3 + 4

Would you like further details or have any questions?


Here are 5 related questions to consider:

  1. How would f(x)f(x) change if the constant outside the square root in g(x)g(x) was different?
  2. What if we used a different exponent for xx in h(x)h(x); how would that affect g(x)g(x)?
  3. Can we choose multiple different g(x)g(x) and h(x)h(x) pairs for the same f(x)f(x)?
  4. What types of functions work well with function composition, and why?
  5. How does function composition affect the domain and range of the resulting function?

Tip: When breaking down complex functions, start by identifying "outer" and "inner" parts to simplify composition.

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Math Problem Analysis

Mathematical Concepts

Function Composition
Square Root Function
Polynomial Functions

Formulas

f(x) = g(h(x))
f(x) = √(-2x^3 + 4) + 2

Theorems

Function Composition

Suitable Grade Level

Grades 10-12