# Math Help - Logarithm exponential, solve for x

1. ## Logarithm exponential, solve for x

I don't know how to solve this.

2. Originally Posted by mwok
I don't know how to solve this.
Take natural logarithms of both sides, noting that:

$ln(e^{f(x)}) = f(x)$

3. Take not lne = 1

e^1-2x = 5
lne^1-2x = ln 5 ( ln both sides )
1-2x(lne) = ln5
1-2x = ln5
2x = 1-ln5
x = 1-ln5/2