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any positive real number has two square roots, one positive and one negative
==Two square roots ==
==Two square roots ==
All numbers other than zero have two square roots that differ by a factor of -1:
All numbers other than zero have two square roots, one positive and one negative: <ref>"Note that any positive real number has two square roots, one positive and one negative. For example, the square roots of 9 are -3 and +3, since (-3)^2==(+3)^2==9." [http://mathworld.wolfram.com/SquareRoot.html Wolfram Research] - Eric Weisstein </ref>
:<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>