Determine the increment of the following function:
F(x) = x + 2/x
For the following interval:
x to x + ∆x

so if x = x --> f(x) = x + 2/x
and if x = x + ∆x --> f(x + ∆x) = x + ∆x + 2/(x + ∆x)

when x = 1 so f(1) = 1 + 2/1 = 3
and so on..