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√(-2 x 2) = √-4 = √(4 x -1)

The square root of a real number has equal positive and negative numbers.

√4 is therefore ±2

There is an identity in mathematics such that i2 = -1

√-1 is therefore i

Putting these two aspects together gives, √(-2 x 2) = √(-1 x 4) = ±2i

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Q: What is the square root of negative two x two?
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