# Math Help - Natural Logs

1. ## Natural Logs

Hi!
I was wondering if anyone could help me solve for x in this problem:

(e^x+e^-x)/(3)=4

Thanks!

2. Originally Posted by KDonicki
Hi!
I was wondering if anyone could help me solve for x in this problem:

(e^x+e^-x)/(3)=4

Thanks!
$e^x + e^{-x} = 12 \mbox{ and let }y=e^{-x}$

$y+\frac{1}{y} = 12 \implies y^2 + 1 = 12 y$