Let be a continuous function on an open interval  where  is in . If  has an extremum at , then  must be a critical number of .

College Algebra (MindTap Course List)
12th Edition
ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
Publisher:R. David Gustafson, Jeff Hughes
Chapter3: Functions
Section3.3: More On Functions; Piecewise-defined Functions
Problem 98E: Determine if the statemment is true or false. If the statement is false, then correct it and make it...
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Fermat’s Theorem:

Let be a continuous function on an open interval  where  is in .

If  has an extremum at , then  must be a critical number of .

Expound this theorem.

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