Math Problem Statement

Write a simplified expression for g(h(x)) in terms of x. g(x) = (2x)^3 and h(x) = (√x)/2. Are functions g and h inverses?

Solution

Let's solve the problem shown in the image step by step.

Problem Breakdown:

  1. Given Functions:

    • g(x)=(2x)3g(x) = (2x)^3
    • h(x)=x2h(x) = \frac{\sqrt{x}}{2}
  2. Task:

    • Find the simplified expression for g(h(x))g(h(x)).
    • Determine if gg and hh are inverses.

Step 1: Compute g(h(x))g(h(x))

To find g(h(x))g(h(x)), substitute h(x)h(x) into g(x)g(x): g(h(x))=g(x2)g(h(x)) = g\left(\frac{\sqrt{x}}{2}\right) Now substitute x2\frac{\sqrt{x}}{2} into g(x)=(2x)3g(x) = (2x)^3: g(x2)=(2x2)3=(x)3=x3/2g\left(\frac{\sqrt{x}}{2}\right) = \left(2 \cdot \frac{\sqrt{x}}{2}\right)^3 = \left(\sqrt{x}\right)^3 = x^{3/2} So, g(h(x))=x3/2g(h(x)) = x^{3/2}.

Step 2: Check if gg and hh are Inverses

For g(x)g(x) and h(x)h(x) to be inverses, we need to check if: g(h(x))=xandh(g(x))=xg(h(x)) = x \quad \text{and} \quad h(g(x)) = x

We already found g(h(x))=x3/2g(h(x)) = x^{3/2}, which is not equal to xx in general, so they are not inverses.

Final Answers:

  1. The simplified expression for g(h(x))g(h(x)) is x3/2x^{3/2}.
  2. Functions gg and hh are not inverses.

Let me know if you have any further questions or need more details!


Related Questions:

  1. How would you find the inverse of g(x)g(x) if it were invertible?
  2. Can you find an example where two functions are inverses of each other?
  3. What are the steps to verify if two functions are inverses in general?
  4. How would you interpret the result x3/2x^{3/2} in terms of transformations?
  5. What properties of the functions g(x)g(x) and h(x)h(x) led to them not being inverses?

Tip:

Always check both compositions f(g(x))f(g(x)) and g(f(x))g(f(x)) when determining if two functions are inverses.

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Math Problem Analysis

Mathematical Concepts

Functions
Composition of Functions
Inverses

Formulas

g(h(x)) = g(√x/2) = (2 * √x/2)^3
Inverses condition: g(h(x)) = x and h(g(x)) = x

Theorems

Composition of Functions
Inverse Function Theorem

Suitable Grade Level

Grades 9-12