Natural logarithm - Wikipedia, the free encyclopedia
Suppose you have e^(2x + 3) = e^(50x) and you wanted to solve for x;
In order to negate the e's, you would use ln;
ln(e^(2x + 3)) = ln(e^(50x))
2x + 3 = 5x
Further, ln(x) is an exponential function.
It crosses the x-axis at (1,0), (whereas e^(x) cross the y axis at (0,1).
There are are many uses for the natural log. Take a look at the wikipedia site and then list any questions you have thereafter.