True/False: If the domain of f(x) is all real numbers and f'(x) <0 for all x, then lim as x goes to infinity of f(x) = - infinity

College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter2: Functions
Section: Chapter Questions
Problem 8CC: What does it mean to say that f(4) is a local maximum valueof f ?
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True/False: If the domain of f(x) is all real numbers and f'(x) <0 for all x, then lim as x goes to infinity of f(x) = - infinity

Expert Solution
Step 1

Consider fx=e-x so domain is all real numbers. 

Also, f'x=-e-x<0

Calculate the limit limxfx=limxe-x=0

Thus, the limit does not go to -infinity. 

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