Find the function f (x) = (1 + 1 / x) ^ x, when x = ± 10, x = ± 100, x = ± 1000, x = ± 10000, what is f (x) = number?

Find the function f (x) = (1 + 1 / x) ^ x, when x = ± 10, x = ± 100, x = ± 1000, x = ± 10000, what is f (x) = number?

When x tends to infinity, the function value is e, which is the natural base