Answer
With the help of constraints.
Work Step by Step
The constraints are used to express all but one of the variables in terms of one independent variable.
Calculus: Early Transcendentals (2nd Edition)
by Briggs, Bill L.; Cochran, Lyle; Gillett, Bernard
Published by
Pearson
ISBN 10:
0321947347
ISBN 13:
978-0-32194-734-5
Chapter 4 - Applications of the Derivative - 4.4 Optimization Problems - 4.4 Exercises - Page 274: 2
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