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.

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter4: Calculating The Derivative
Section4.CR: Chapter 4 Review
Problem 2CR: Determine whether each of the following statements is true or false, and explain why. The derivative...
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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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