Why does TI-84 show scientific notation for zeros sometimes but not others?

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When graphing a function and then going through the process to calculate the zeroes (left bound, right bound, guess), is there a reason that sometimes it shows y = 0, but there are other times when it will show a very small number in scientific notation, for example y = 1.8 E -12? I assume it is due to the fact that the calculator is simply approximating and it can only go down to a certain number of pixels to do so, but then again, when you're literally calculating "zeroes" why would it not just automatically know y should equal zero?