Consider the function. f(x, y) = 2(y + 1)x² Identify the point(s) on the graph of f at which the tangent plane is horizontal (0, 2) (x, 0) for only x ≥ 0 (x, 0) for all x (0, y) for all y (2,0)

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Q: 1) y%= (ans.: max.(1,0.5); min.(-1,-0.5)) 1+ x in (2 3-50,8))

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Q: 4. please help!'   Calculate the domain of the function:

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A: Given that