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mLine 7:
Line 7: − <math>x^2\ = y</math> implies <math>|x| = \sqrt{y}</math>
absolute value just confuses the matter
==Two square roots ==
==Two square roots ==
This shows that all numbers other than zero have two square roots, one positive and one negative:
This shows that all numbers other than zero have two square roots, one positive and one negative: