Formula for a surface

Find a plausible formula for the surface shown below:


  • I believe that this surface could be created using the formula %%y = x^2-4%% in 3 dimensions. As for the plane that the surface is intersecting, it appears to lie on the x,y plane therefore that would be %%z = 0%%.

    Here is a surface I generated in Math3D. It looks pretty similar.

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