Comment by tyromaniac

> I have a function f, how do I find its maximum

We want to find the largest number in the f function. First, we set the formula for max = f(x) + 1. Next, we put x in the second term of the formula. Then, we put 1 in the first term. So, we multiply the first term by 1: f(1) = f(x + 1). Answer: f(x+1)