# Thread: Solve this 'e' question for x.

1. ## Solve this 'e' question for x.

I am having more trouble with this then I probably should be, I just can't seem to figure it out. Its

$e^{-2x}-3e^{-x}=-2$

Thanks as always.
Ryan.

2. ## Re: Solve this 'e' question for x.

Originally Posted by rushton
I am having more trouble with this then I probably should be, I just can't seem to figure it out. Its

$e^{-2x}-3e^{-x}=-2$

Thanks as always.
Ryan.
Substitute:

$e^{-x}=t$ so...

3. ## Re: Solve this 'e' question for x.

Of course, now you say that it is smacking me in the face. I tried other substitutions but not that one for some silly reason.

Thanks a lot!