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Every square root has two solution
For example <math>\sqrt{-1}</math> has imaginary representation of
For example <math>\sqrt{-1}</math> has imaginary representation of
:<math>\sqrt{-1}= i</math>.
:<math>\sqrt{-1}= \pm i</math>.
When a imaginary number is added to real number, they form a [[complex number]].
When a imaginary number is added to real number, they form a [[complex number]].