I was wondering if anyone could help me with some homework.(adsbygoogle = window.adsbygoogle || []).push({});

I have the equation y = [(e^x)-3]/[(e^x)+1] and need to find its inverse.

I take the natural ln of both sides and get :

lny = (x-3)/(x+1)

Then I multiple the denominator to the other side and get

lny(x+1) = x -3

Then i just add three to both sides and switch the x and y's to get the inverse

y = lnx (x+1) +3

My teacher got the answer:

x = ln [ (3+x)/(1-x)]

How??

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Ln Help

**Physics Forums | Science Articles, Homework Help, Discussion**