How to use quadratic regression for binary classification problems

Hello, I need help with an exercise. I have fitted a quadratic regression model for classification, where the cut-off point is 0.5, that is, if y> 0.5 is classified in class 1, otherwise in class zero. I want you to help me make the graph in R, I think it is a parabola, but the teacher shows another graph like a hyperball

for a guide on how to make graphs of your data you can study R4DS

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