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If you need both roots ...
The positive square root is the length of one side of a square. Multiply the length by itself, and the product is the area of the square.
The positive square root is the length of one side of a square. Multiply the length by itself, and the product is the area of the square.
The symbol for the non-negative square root of ''x'' is <math>\sqrt{x}</math>.
The usual symbol for the square root of ''x'' is <math>\sqrt{x}</math>. If you need both roots, use
<math>\pm \sqrt{x}</math>
==Two square roots ==
==Two square roots ==