> Jonathan Lang wrote: >> > When you take the square root of a number, you actually get one of two >> > possible answers (for instance, sqrt(1) actually gives either a 1 or a >> > -1).

Not quite. Itıs true that there are two possible square roots of any given number, but sqrt(1) is defined as the positive one. The radical sign is also defined as the positive one in standard mathematical notation, btw; you have to put a +/- in front of it to get the ³junctive² value.