Math Problem Statement

The functions f(x) = (2x + 1) / 10 and g(x) = 10 / (2x - 1) are inverses. True or False?

Solution

To determine whether the functions f(x)=2x+110f(x) = \frac{2x+1}{10} and g(x)=102x1g(x) = \frac{10}{2x-1} are inverses, we can check if f(g(x))=xf(g(x)) = x and g(f(x))=xg(f(x)) = x. Let's compute these one by one.

  1. Check f(g(x))f(g(x)):

    • First, substitute g(x)g(x) into f(x)f(x): f(g(x))=2102x1+110f(g(x)) = \frac{2 \cdot \frac{10}{2x - 1} + 1}{10} Simplify this expression step by step.
  2. Check g(f(x))g(f(x)):

    • Next, substitute f(x)f(x) into g(x)g(x): g(f(x))=1022x+1101g(f(x)) = \frac{10}{2 \cdot \frac{2x+1}{10} - 1} Simplify this to see if the result is xx.

I'll now compute both expressions to verify whether the functions are inverses.The computations yield the following results:

  1. f(g(x))=2x+1910(2x1)f(g(x)) = \frac{2x + 19}{10(2x - 1)}
  2. g(f(x))=25x2g(f(x)) = \frac{25}{x - 2}

Since neither f(g(x))f(g(x)) simplifies to xx nor g(f(x))g(f(x)) simplifies to xx, the functions f(x)=2x+110f(x) = \frac{2x+1}{10} and g(x)=102x1g(x) = \frac{10}{2x-1} are not inverses of each other.

Therefore, the correct answer is False.

Would you like more details on any part of the process? Here are some follow-up questions for further practice:

  1. What does it mean for two functions to be inverses in general?
  2. How can you algebraically derive the inverse of a given function?
  3. Why is verifying f(g(x))=xf(g(x)) = x and g(f(x))=xg(f(x)) = x necessary to confirm that functions are inverses?
  4. Can a function always have an inverse?
  5. What would the graph of two inverse functions look like?

Tip: When finding the inverse of a function, remember to swap xx and yy and solve for yy.

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Math Problem Analysis

Mathematical Concepts

Inverse Functions
Function Composition

Formulas

f(g(x)) = x
g(f(x)) = x

Theorems

Inverse Function Theorem

Suitable Grade Level

Grades 9-12