The question is...

Rewrite the equation tn=ar^n-1 to solve for 'n'

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- May 24th 2007, 05:44 PMstlawrenceriverrewriting a geometric sequence formula to solve for 'n'
The question is...

Rewrite the equation tn=ar^n-1 to solve for 'n' - May 24th 2007, 05:47 PMThePerfectHacker
- May 24th 2007, 05:50 PMstlawrenceriver
that's the problem, there is no value for tn

- May 24th 2007, 05:54 PMJhevon
$\displaystyle t_n = ar^{n - 1}$

$\displaystyle \Rightarrow r^{n - 1} = \frac {t_n}{a}$

$\displaystyle \Rightarrow ln \left( r^{n - 1} \right) = ln \left( \frac {t_n}{a} \right) $

$\displaystyle \Rightarrow (n - 1) ln(r) = ln \left( \frac {t_n}{a} \right) $

$\displaystyle \Rightarrow n = \frac {ln \left( \frac {t_n}{a} \right) }{ln(r)} + 1$ - May 24th 2007, 05:56 PMJhevon
- May 24th 2007, 06:34 PMstlawrenceriver
Thank you so much for the help, now I know what I'm doing.:)