Question: Consider two variable function z = x2): + 21y + %y3 - 3y. (a) Find the partial derivatives zJr and zy. (b) Find all critical

Consider two variable function z = x2): + 21y + %y3 - 3y. (a) Find the partial derivatives zJr and zy. (b) Find all critical points of the function. (e) Determine Whether each of the critical points is a saddle point or the function attains a relative maximumfminirnum at this point

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