# stupid question on natural logs

#### LordSnailz

##### Diamond Member
Never thought I would need this at work but I do

I'm trying to a regression on the following equation y = a*exp(b*x)+1 but it doesn't seem like I'm able to simplify to a linear equation.

If there wasn't the +1 term, it would give ln(y) = ln(a)+b*x, but with the +1 term, I'm getting ln(y) = ln(a*exp(b*x)+1) ... is there way a to break up the right side?

#### magomago

##### Lifer
why not do a taylor series expansion on it? Keep as many coefficients as you want depending on how accurate you actually care for

#### jemcam

##### Diamond Member
I usually just flush them without worrying about breaking them up.

#### speg

##### Diamond Member
ln(y-1) = ln(a)+b*x ?

#### BoomerD

##### No Lifer
log splitter works well for me...

#### simpletron

##### Member
ln(y-1)=ln(a)+b*x, maybe you can use this and just shift the y by one at the end

#### JulesMaximus

##### No Lifer
I use a big sledge hammer and a wood splitter.