Given the formula (source) $ M = P \times \frac{J}{1 - (1 + J)^{-N}}$ Assume $P$ and $J$ remain constant. I want to be able to find $N$ for given $M.$
Could you please give an example of a numeric method (like secant to solve the same)? [My] problem is how to find initial 2 values for the secant formula.