Let us define a number a to be a fixed point of a function f if a = f(a). (For example, if f (x) = -x², then x = -1 is a fixed point because f(-1) = -1.) Prove that if f'(x) # 1 for all numbers x, then f has at most one fixed point.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter4: Polynomial And Rational Functions
Section4.1: Polynomial Functions Of Degree Greater Than
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Let us define a number a to be a fixed point of a function f if a = f(a). (For example, if
f (x) = -x², then x =
-1 is a fixed point because f(–1) = -1.)
Prove that if f'(x) # 1 for all numbers x, then f has at most one fixed point.
Transcribed Image Text:Let us define a number a to be a fixed point of a function f if a = f(a). (For example, if f (x) = -x², then x = -1 is a fixed point because f(–1) = -1.) Prove that if f'(x) # 1 for all numbers x, then f has at most one fixed point.
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