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Use excel to estimate maximum of this function with surface and contour plots (use interval -5 < x < 5 and -5 sy s5 .

Use excel to estimate maximum of this function with surface and contour plots (use interval -5 < x < 5 and -5 sy s5 . Then use solver add-in to find maximum value of the function.

f(x,y) = 2.25xy + 1.75y – 1.5x² – 2y²

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