So whenever you just see log of 100, it's implicitly base 10. And you also have a button for natural log, which is log base e. Natural log of x is equal to log base e of x. But sometimes you want to find all sorts of different base logarithms, and this is how you do it. So if you're using your calculator and you wanted to find, if you wanted to find what log base three of eight is, you would say, you would type in your calculator log of eight and log of three. Or, let me write it this way, and log of three, where both of these are implicitly base 10. And you'd get the same value if you did natural log of eight divided by natural log of three, which you might also have on your calculator. And what we're gonna do in this video is leverage the natural log, because we know what the derivative of the natural log is.