I have data:

x = 1.0, y = 1.5

x = 2.0 y = 0.45

x = 3.0 y = 0.21111

x = 4.0, y = 0.121324

I know this data comes from a function that has 2 or more inverse square functions added to each other. Example...

y = (A / x^2) + (B / (C + X)^2)

or

y = (A / x^2) + (B / (C + X)^2) + (D / (F + X)^2)

etc....

How can I solve for the constants when there are two added inverse square functions or more? Any suggestions would be greatly appreciated.

Thanks in advance,

David