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  • $\begingroup$ You are more likely to get an answer if you were to edit your post to include code that could serve as a minimal working example of your problem. As it is currently posted you have not given sufficient context for me (and many others who might want to help you) to work on your problem. $\endgroup$ Commented May 25, 2019 at 4:24
  • $\begingroup$ You might want to try it with model = (2 c/(Sqrt[b^2 - 4 (a x + 1) c] + b))^2 and then NonlinearModelFit[data, {model, c < 0}, {a, b, c}, x]. $\endgroup$ Commented May 25, 2019 at 4:48