Hi all, I need to get the R2 of a formula like this

f(t) = a + b*c^t

I've tried with LINEST(Range Y,LN(Range X),,TRUE) then the array three
cells down and it should appear, but the numbers I get applies only
to:

f(t) = b*c^t

Anybody knows how to get the real value or the r2 in any other way?

Thanks NlCO


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