In the logistic equation, they say $\frac{dx}{dt} = rx(1-x)$ is equal to $x_{n+1} = rx_{n}(1-x_{n})$. How do they do that? And if you were to transform $\frac{dx}{dt} = 2$ to the recurrence equation, how does it turn out?
P.S. My math skill is the level of high school math.