linear least regression solving a and b from given data

From the following question in Part 2 I try to find a and b to fit the data above as f(x) = a/((x^2)+b)

from my code as I create linear regression function

and call back function

also polting graph

I wonder why my linear regression point is not on the given function that it soppose to.

Answer 1

[Torsten]

b = a0/a1

instead of

b = a0

[Phuri Nittiwat]

Thank you!