It would depend on the feasible region.
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Since there is no feasible region defined, there is no answer possible.
If we knew the values of 'x' and 'y', and the boundaries of the feasible region, we could answer that question quickly and easily.
Unfortunately, limitations of the browser used by Answers.com means that we cannot see most symbols. It is therefore impossible to give a proper answer to your question. Please resubmit your question spelling out the symbols as "plus", "minus", "equals", "squared", "cubed" etc. There is no visible operator between 3x4y unless some of them are meant to be powers. Also, it is necessary to know the feasible region. But since you have not bothered to provide that information, I cannot provide a sensible answer.
8
20 and the vertex of the parabola is at (3, 20)