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

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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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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