Question: please help Find all points on the surface given below where the tangent plane is horizontal. z=x2 -4xy-y - 6x +2y The coordinates are (Type

please help

Find all points on the surface given below where the tangent plane is horizontal. z=x2 -4xy-y - 6x +2y The coordinates are (Type an ordered triple. Use a comma to separate answers as needed.)

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2. Find out if there are other reference points that can be used as reasonable alternatives.

1. Identify your reference point when making a decision based on an element of risk.

3. If there are reasonable alternatives, think about your decisions based on the different reference points and see if there are any contradictions in the decisions.