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Line 3:
Line 3: − + − + − These two square roots don't have to be distinct. For example, the square root of zero has two values: +0 and -0. (While these may seem to be identical, in the mathematics of limits, they can have differing characteristics.)
+0 and -0 aren't numbers - see limit
The symbol for the square root of ''x'' is <math>\sqrt{x}</math>.
The symbol for the square root of ''x'' is <math>\sqrt{x}</math>.
==Two square roots for each number==
==Two square roots ==
All numbers have two square roots that differ by a factor of -1:
All numbers other than zero have two square roots that differ by a factor of -1:
:<math>3 \cdot 3 = 9</math> and <math>-3 \cdot -3 = 9</math>
:<math>3 \cdot 3 = 9</math> and <math>-3 \cdot -3 = 9</math>
When speaking of "''the'' square root of ''x''", people usually refer to the positive square root. For example:
When speaking of "''the'' square root of ''x''", people usually refer to the positive square root. For example: