Let ƒ(x) = (ax + b )/(cx + d ), c ≠ 0, ad - bc ≠ 0. a. Give a convincing argument that ƒ is one-to-one. b. Find a formula for the inverse of f.

College Algebra
1st Edition
ISBN:9781938168383
Author:Jay Abramson
Publisher:Jay Abramson
Chapter3: Functions
Section3.7: Inverse Functions
Problem 2SE: Why do we restrict the domain of the function f(x)=x2 to find the function's inverse?
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Let

ƒ(x) = (ax + b )/(cx + d ), c ≠ 0, ad - bc ≠ 0.

a. Give a convincing argument that ƒ is one-to-one.

b. Find a formula for the inverse of f.

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