Two positive numbers have a product of 81. Find the minimum possible value of their sum.(You must use the derivative of a function)

Algebra for College Students
10th Edition
ISBN:9781285195780
Author:Jerome E. Kaufmann, Karen L. Schwitters
Publisher:Jerome E. Kaufmann, Karen L. Schwitters
Chapter8: Functions
Section8.6: Combining Functions
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Two positive numbers have a product of 81. Find the minimum possible value of their sum.
(You must use the derivative of a function)

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