What is the negative square root of X?

Likewise we agree by way of notational convention that − x is the negative square root of x. Of course, every positive real number, x, has two square roots, x and − x, positive and negative real numbers respectively. I worry sometimes about what gets taught by way mathematics in secondary school these days.
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https://math.stackexchange.com/questions/809424/can-the-square-root-of-a-real-number-be-negative
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