Hi,

My problem is to find the inverse of .

I can get up to using for , and that

The using the quadratic formula I get

Here I am stuck

Sorry for bad format.

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- March 19th 2010, 02:57 AMromjkeInverse of equation involving e^(-x)
Hi,

My problem is to find the inverse of .

I can get up to using for , and that

The using the quadratic formula I get

Here I am stuck

Sorry for bad format. - March 19th 2010, 03:25 AMDeadstar
Following on from where you left off...

(since )

Note that so we get

Now since , take natural logs of both sides to get...

..? Can you finish? - March 19th 2010, 03:43 AMromjke
Yes.

I kept going around in circles about what to do with the square root in the quadratic formula.

All is good now. Thanks - March 19th 2010, 04:11 PMmr fantastic