If we know our base and we know our y, the result and we don't know our e, there's nothing we can do in this form to solve this problem. But what we can do is simply convert this guy to log form and we get log of x, which is what we know. In parentheses is our y, which is also what we know. And we want to find our e. So now we have this entire guy. We don't count this guy. So now what we can do is simply plug this guy to the calculator, get an answer, and that's our e. Now suppose we were in the opposite situation.