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Ch. 7 - Transcendental Functions
Hass - Thomas' Calculus 15th Edition
Hass15th EditionThomas' CalculusISBN: 9780137616077Not the one you use?Change textbook
All textbooksHass 15th EditionCh. 7 - Transcendental FunctionsProblem 7.1.73
Chapter 7, Problem 7.1.73

In Exercises 73 and 74, repeat the steps above to solve for the functions y=f(x) and x=f^(-1)(y) defined implicitly by the given equations over the interval.
73. y^(1/3) - 1 = (x+2)³, -5 ≤ x ≤ 5, x_0 = -3/2

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1
Start with the given implicit equation: \(y^{\frac{1}{3}} - 1 = (x + 2)^3\).
To find \(y = f(x)\), isolate \(y\) by first adding 1 to both sides: \(y^{\frac{1}{3}} = (x + 2)^3 + 1\).
Next, cube both sides to solve for \(y\): \(y = \left((x + 2)^3 + 1\right)^3\).
To find the inverse function \(x = f^{-1}(y)\), start again from the original equation and solve for \(x\) in terms of \(y\): \(y^{\frac{1}{3}} - 1 = (x + 2)^3\).
Take the cube root of both sides to isolate \(x + 2\): \(x + 2 = \sqrt[3]{y^{\frac{1}{3}} - 1}\), then solve for \(x\): \(x = \sqrt[3]{y^{\frac{1}{3}} - 1} - 2\).

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Implicit Functions

An implicit function is defined by an equation relating x and y without explicitly solving for y. Understanding how to manipulate and interpret such equations is essential for finding y as a function of x or vice versa, especially when direct algebraic solutions are complex or unavailable.
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Inverse Functions

The inverse function reverses the roles of dependent and independent variables, turning y = f(x) into x = f⁻¹(y). Recognizing how to find and verify inverse functions is crucial when the problem asks for x as a function of y, often requiring solving the original equation for x.
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Domain and Interval Considerations

Specifying the interval for x (e.g., -5 ≤ x ≤ 5) restricts the domain and ensures the function and its inverse are well-defined and single-valued. Understanding how domain restrictions affect the existence and uniqueness of solutions is key to correctly solving and interpreting the problem.
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Finding the Domain and Range of a Graph
Related Practice
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