By using Rolle's theorem it is impossible for the function f(x)=(x^5) + x - 12 to have two real roots.  This is because if f(x) has two real roots then by Rolle's theorem, f '(x) must be _________ at certain value of x between these two roots, but f '(x)  is always positive.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter4: Polynomial And Rational Functions
Section4.5: Rational Functions
Problem 54E
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By using Rolle's theorem it is impossible for the function f(x)=(x^5) + x - 12 to have two real roots. 

This is because if f(x) has two real roots then by Rolle's theorem, f '(x) must be _________ at certain value of x between these two roots, but f '(x)  is always positive.  

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