Math Problem Statement

For x ≥ 0, the functions f(x) = 2x - 6 and g(x) = (2√x / 3) + 7 are given. Find g⁻¹(x).

Solution

Let's solve this step by step.

The function g(x)g(x) is given as: g(x)=2x3+7g(x) = \frac{2\sqrt{x}}{3} + 7

We need to find the inverse function g1(x)g^{-1}(x).

Steps to Find g1(x)g^{-1}(x):

  1. Replace g(x)g(x) with yy: y=2x3+7y = \frac{2\sqrt{x}}{3} + 7

  2. Swap xx and yy (to reflect the inverse relationship): x=2y3+7x = \frac{2\sqrt{y}}{3} + 7

  3. Solve for yy:

    • Subtract 7 from both sides: x7=2y3x - 7 = \frac{2\sqrt{y}}{3}

    • Multiply through by 3: 3(x7)=2y3(x - 7) = 2\sqrt{y}

    • Divide by 2: 3(x7)2=y\frac{3(x - 7)}{2} = \sqrt{y}

    • Square both sides to remove the square root: y=(3(x7)2)2y = \left( \frac{3(x - 7)}{2} \right)^2

Thus, the inverse function is: g1(x)=(3(x7)2)2g^{-1}(x) = \left( \frac{3(x - 7)}{2} \right)^2

Let me know if you'd like further explanation or assistance! Here are some additional questions and tips related to this:


Questions:

  1. How do you verify if a function and its inverse are correct?
  2. Can the domain of g(x)g(x) affect the inverse function?
  3. What does the graph of g(x)g(x) and g1(x)g^{-1}(x) look like?
  4. How does the square root in g(x)g(x) impact the range of g1(x)g^{-1}(x)?
  5. Can you find g1(x)g^{-1}(x) for a similar function like g(x)=x+24g(x) = \frac{\sqrt{x} + 2}{4}?

Tip:

Always check if the function and its inverse satisfy g(g1(x))=xg(g^{-1}(x)) = x and g1(g(x))=xg^{-1}(g(x)) = x to confirm your solution

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Math Problem Analysis

Mathematical Concepts

Algebra
Inverse Functions
Radicals and Exponents

Formulas

Inverse function process: Swap x and y, then solve for y
Square root and squaring process

Theorems

Inverse Function Property: g(g⁻¹(x)) = x

Suitable Grade Level

Grades 10-12