Math Problem Statement

f(x) = 2x+1, g(x) = x^5, h(x) = 1/x

express each of the following in terms of f, g, h as appropriate:

  1. x->(2x+1)^5
  2. x-> x^(1/5)
  3. x-> 2/(x-1)

Solution

To express each transformation in terms of f(x)=2x+1f(x) = 2x + 1, g(x)=x5g(x) = x^5, and h(x)=1xh(x) = \frac{1}{x}, let's analyze each expression.

Solution:

  1. x(2x+1)5x \to (2x+1)^5:

    • This expression can be written as a composition of f(x)f(x) and g(x)g(x).
    • Specifically, let f(x)=2x+1f(x) = 2x + 1 and then apply g(x)=x5g(x) = x^5 to this result.
    • Thus, we have:
      xg(f(x))=(2x+1)5x \to g(f(x)) = (2x + 1)^5
  2. xx1/5x \to x^{1/5}:

    • Here, we want a function that gives the fifth root of xx.
    • We can express this as the inverse of g(x)=x5g(x) = x^5.
    • So, we write:
      xg1(x)=x1/5x \to g^{-1}(x) = x^{1/5}
  3. x2x1x \to \frac{2}{x - 1}:

    • This expression can be created using a combination of h(x)=1xh(x) = \frac{1}{x} and a modified form of f(x)=2x+1f(x) = 2x + 1.
    • First, shift xx by subtracting 1, then invert it with h(x)h(x), and finally multiply by 2.
    • We express it as:
      x2h(x1)=2x1x \to 2 \cdot h(x - 1) = \frac{2}{x - 1}

Would you like further details on any of these transformations, or do you have any questions?


Related Questions:

  1. How do you find the inverse of a function like g(x)=x5g(x) = x^5?
  2. How can compositions of functions like f(g(x))f(g(x)) be simplified further?
  3. What would the derivative of g(f(x))g(f(x)) be in terms of xx?
  4. How can we express x(2x+1)1/5x \to (2x + 1)^{1/5} in terms of ff and gg?
  5. How do you determine if a function has an inverse?

Tip: When dealing with compositions, always apply the inner function first, then the outer function, as this order affects the final result.

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Math Problem Analysis

Mathematical Concepts

Function Composition
Inverse Functions
Transformation of Functions

Formulas

f(x) = 2x + 1
g(x) = x^5
h(x) = 1/x
g(f(x)) = (2x + 1)^5
g^(-1)(x) = x^(1/5)
2 * h(x - 1) = 2 / (x - 1)

Theorems

Inverse Function Theorem

Suitable Grade Level

Grades 10-12