Refer to the Example 4. Use calculus to obtain the location of the estimated maximum yield when all terms are included in the model.

Data From Example 4

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EXAMPLE 4 A response surface design to maximize yield A compound is produced for a coating process. It is added to an otherwise fixed recipe and the coating process is completed. Yield is the response variable. Two factors x1 and x2 have been identified as "vital," and they are Factor (x;) Additive amount Reaction temperature Range 0-70 gm/kg 100-180C The goal of the experiment is to improve the yield. The business requires that yield be greater than 95%.