Square root of -4 complex number

1 answer:

7 0

$~~~~\sqrt{-4}\\\\=\sqrt{-1 \cdot 4}\\\\=\sqrt{-1} \cdot \sqrt{4}\\\\=2i~~~~~~~~~~~~~~~~~~~~~~~~~~~~~;\left[\text{The imaginary unit,} i=\sqrt{-1} \right]$

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Step-by-step explanation:

We have,

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