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What are extrema and saddle points of $f (x, y) = x^{3} y + 36 x^{2} - 8 y$ $f(x, y) = x^3y + 36x^2 - 8y$ ?

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Frederico Guizini S.

Apr 25, 2018

See the answer below:
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Explanation:

Credits:
Thanks to Graphing Calculator 3D (https://www.runiter.com/graphing-calculator/) who provided the software to plot the 3D function with the results.

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