/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 36 Find functions \(f\) and \(g\) s... [FREE SOLUTION] | 91Ó°ÊÓ

91Ó°ÊÓ

Find functions \(f\) and \(g\) such that \(h=g \circ f .\) (Note: The answer is not unique.) \(h(x)=\left(3 x^{2}-4\right)^{-3}\)

Short Answer

Expert verified
We can find the functions \(f\) and \(g\) such that \(h = g \circ f\) by defining \(f(x) = 3x^2 - 4\) and \(g(x) = x^{-3}\). When composed, we get \(h(x) = g(f(x)) = g(3x^2 - 4) = (3x^2 - 4)^{-3}\), which confirms our solution.

Step by step solution

01

Find the function f

Let's find the function \(f\) that gives us the expression inside the parenthesis. We can simply define \(f(x) = 3x^2 - 4\).
02

Find the function g

Now, let's find the function \(g\) that applies the power of -3 to the result of function \(f\). We can define \(g(x) = x^{-3}\).
03

Verify the solution

To make sure we have found the correct functions, we need to check if \(h(x) = g(f(x))\): \(h(x) = g(f(x)) = g(3x^2 - 4) = (3x^2 - 4)^{-3}\) As we can see, our solution is correct, as \(h(x) = g \circ f\).

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91Ó°ÊÓ!

Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Function Composition
In mathematics, function composition is akin to putting together two different processes to form a new one. It's like stacking coins, where you place one on top of the other to make a taller stack. Composing functions means using the output of one function as the input of another.

When you see notation like \( g \circ f \), it means you take the result from applying function \( f \) to \( x \) and then use that result as the input for function \( g \). Think of it as a two-step dance: start with \( x \), apply \( f \), and then apply \( g \).

Why does function composition matter? It allows you to create complex operations from simpler ones. In our exercise, we composed functions \( f \) and \( g \) to match the function \( h(x) = (3x^2 - 4)^{-3} \). Here, \( f(x) = 3x^2 - 4 \) sets the stage, and then \( g(x) = x^{-3} \) performs the grand finale by raising the result to the power of \(-3\).
  • Method: Use the output of one function as the input for another
  • Notation: \( g \circ f \) means \( g(f(x)) \)
  • Purpose: Simplifies complex problems
Inverse Functions
Inverse functions are like the reverse gear in a car. They take you back to where you started. For any function \( f \), the inverse \( f^{-1} \) undoes its operation, meaning \( f(f^{-1}(x)) = x \) and vice versa.

Understanding inverses is crucial in solving equations where you need to "reverse" a function's action. Imagine you have a lock-code you created, and the inverse helps you decode it.

In the context of our exercise, finding the inverse wasn't explicitly required, but understanding how functions invert can enhance comprehension of related topics.
  • Role: Finds the original input based on output
  • Notation: \( f^{-1} \) refers to the inverse of function \( f \)
  • Usage: Helpful in equations and undoing processes
Mathematics Problem Solving
Mathematics is often seen as a series of puzzles waiting to be solved. Solving these puzzles involves following logical steps to uncover hidden truths. Problem-solving in mathematics requires creativity and logic.

In the presented problem, we engaged in a systematic breakdown: finding two functions \( f \) and \( g \) such that their composition produced the given \( h(x) \). This strategy helped us divide a complex problem into manageable tasks.

Successful mathematical problem solving often includes:
  • Identifying the problem clearly
  • Strategically breaking down the problem
  • Employing logical reasoning and checking solutions
The beauty of mathematics is that problems can be solved in various ways, offering multiple perspectives. The exploration of different outcomes and strategies enriches understanding and enhances problem-solving skills.

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

The ratio of working-age population to the elderly in the United States (including projections after 2000 ) is given by $$ f(t)=\left\\{\begin{array}{ll} 4.1 & \text { if } 0 \leq t<5 \\ -0.03 t+4.25 & \text { if } 5 \leq t<15 \\ -0.075 t+4.925 & \text { if } 15 \leq t \leq 35 \end{array}\right. $$ with \(t=0\) corresponding to the beginning of 1995 . a. Sketch the graph of \(f\). b. What was the ratio at the beginning of 2005 ? What will be the ratio at the beginning of 2020 ? c. Over what years is the ratio constant? d. Over what years is the decline of the ratio greatest?

A ball is thrown straight upward from the ground and attains a height of \(s(t)=-16 t^{2}+128 t+\) \(4 \mathrm{ft}\) above the ground after \(t \mathrm{sec}\). When does the ball reach the maximum height? What is the maximum height?

CANCER SURVIVORS The number of living Americans who have had a cancer diagnosis has increased drastically since 1971 . In part, this is due to more testing for cancer and better treatment for some cancers. In part, it is because the population is older, and cancer is largely a disease of the elderly. The number of cancer survivors (in millions) between \(1975(t=0)\) and \(2000(t=25)\) is approximately $$ N(t)=0.0031 t^{2}+0.16 t+3.6 \quad(0 \leq t \leq 25) $$ a. How many living Americans had a cancer diagnosis in \(1975 ?\) In \(2000 ?\) b. Assuming the trend continued, how many cancer survivors were there in 2005 ?

BROADBAND VERSUS DIAL-UP The number of U.S. broadband Internet households (in millions) between the beginning of \(2004(t=0)\) and the beginning of \(2008(t=4)\) was estimated to be $$ f(t)=6.5 t+33 \quad(0 \leq t \leq 4) $$ Over the same period, the number of U.S. dial-up Internet households (in millions) was estimated to be $$ g(t)=-3.9 t+42.5 \quad(0 \leq t \leq 4) $$ a. Sketch the graphs of \(f\) and \(g\) on the same set of axes. b. Solve the equation \(f(t)=g(t)\) and interpret your result.

DIAL-UP INTERNET HoUSEHOLDS The number of U.S. dialup Internet households stood at \(42.5\) million at the beginning of 2004 and was projected to decline at the rate of 3\. 9 million households per year for the next 6 yr. a. Find a linear function \(f\) giving the projected U.S. dial-up Internet households (in millions) in year \(t\), where \(t=0\) corresponds to the beginning of 2004 . b. What is the projected number of U.S. dial-up Internet households at the beginning of \(2010 ?\)

See all solutions

Recommended explanations on Math Textbooks

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.