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Ch. 2 - Functions and Graphs
Blitzer - College Algebra 8th Edition
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Tutti i libri di testoBlitzer 8th EditionCh. 2 - Functions and GraphsProblema 95
Capitolo 3, Problema 95

Determine whether each statement is true or false. If the statement is false, make the necessary change(s) to produce a true statement.
If f(x)=3xf(x) = 3x and g(x)=x+5g(x) = x + 5, find (f∘g)−1(x)\(\left\)(f\(\circ\) g\(\right\))^{-1}(x) and (g−1∘f−1)(x)(g^{-1} \(\circ\) f^{-1})(x).

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First, understand the notation: (ƒ 0 g)(x) means the composition of functions f and g, which is f(g(x)). Similarly, (ƒ 0 g)^{-1}(x) means the inverse of the composition f(g(x)).
Step 1: Find the composition (ƒ 0 g)(x) by substituting g(x) into f. Since f(x) = 3x and g(x) = x + 5, write the expression for f(g(x)) as \(f(g(x)) = 3(x + 5)\).
Step 2: To find the inverse of the composition, set \(y = 3(x + 5)\) and solve for x in terms of y. This involves isolating x on one side of the equation.
Step 3: Next, find the inverse functions individually: find \(f^{-1}(x)\) by solving \(y = 3x\) for x, and find \(g^{-1}(x)\) by solving \(y = x + 5\) for x.
Step 4: Finally, find the composition \((g^{-1} 0 f^{-1})(x)\) by substituting \(f^{-1}(x)\) into \(g^{-1}\). Write the expression for \(g^{-1}(f^{-1}(x))\).

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Function Composition

Function composition involves applying one function to the result of another, denoted as (f ∘ g)(x) = f(g(x)). Understanding how to combine functions correctly is essential for evaluating expressions like (f ∘ g)(x) and manipulating them for further operations.
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An inverse function reverses the effect of the original function, such that f(f⁻¹(x)) = x. Finding the inverse requires solving for x in terms of y and swapping variables. Recognizing and computing inverses is crucial for expressions involving f⁻¹ or g⁻¹.
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Understanding the notation (f ∘ g)⁻¹ and (g⁻¹ ∘ f⁻¹) requires knowing that the inverse of a composition reverses the order: (f ∘ g)⁻¹ = g⁻¹ ∘ f⁻¹. This concept helps correctly interpret and simplify composite inverse functions.
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