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formatting Wolfram footnot
<math>x^2\ = y</math> implies <math>|x| = \sqrt{y}</math>
<math>x^2\ = y</math> implies <math>|x| = \sqrt{y}</math>
This shows that 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>
This shows that 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)<sup>2</sup> = (+3)<sup>2</sup> = 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>