data interpolation

Hello

hope everybody is fine !

Please, I tried to look in old post without success

I'd like to find a sub, capable of giving me a polinomial interpolation of some data

ex

A B
A1 B1
A2 B2
A3 B3

I'd like to find a function like this
B = f(A)

where f = c0+c1*A^1+c2*A^2+c3*A^3

the aim is to get the coefficients

c0
c1
c2
c3

etc

Please, may I ask you if there is something already realized in VB6 ?

Thanks in advance !