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Line 6:
Line 6: − ==Two square roots == − − This shows that all numbers other than zero have two square roots, one positive and one negative: − :<math>3 \cdot 3 = 9</math> and <math>-3 \cdot -3 = 9</math>
repetitive
<math>\pm \sqrt{x}</math>
<math>\pm \sqrt{x}</math>
When speaking of "''the'' square root of ''x''", people usually refer to the positive square root. For example:
When speaking of "''the'' square root of ''x''", people usually refer to the positive square root. For example: