How can I solve somthing like this for i

$\displaystyle 2=\frac{1-(\frac{1}{1+i})^{40}}{i}$

The textbook I'm looking simply states that it's "difficult" to solve by and that it's best to just use a financial calculator.

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- May 8th 2012, 02:33 AMdownthesun01PV formula solving for i
How can I solve somthing like this for i

$\displaystyle 2=\frac{1-(\frac{1}{1+i})^{40}}{i}$

The textbook I'm looking simply states that it's "difficult" to solve by and that it's best to just use a financial calculator. - May 8th 2012, 07:58 AMILikeSerenaRe: PV formula solving for i
Hi downthesun01! :)

The solution is $\displaystyle i \approx 0.499999954781082$

See here:

2=\frac{1-(\frac{1}{1+x})^{40}}{x} - Wolfram|Alpha

Indeed, solving it analytically is not going to work out.