When we get even closer to one from the left, we're getting even closer to two. So a reasonable estimate for the limit as x approaches one from the left of f of x, it looks like x, it looks like f of x, right over here, is approaching two. We don't know for sure. That's why they're saying what is a reasonable estimate. It might be approaching 2.01, or it might be approaching 1.999. On Khan Academy, these will often be multiple choice questions, so you have to pick the most reasonable one. It would not be fair if they gave 1.999 as a choice and 2.01.