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→Two square roots
==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 and negative numbers 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>