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[-] Khanzarate@lemmy.world 10 points 1 month ago

Wouldn't the square root just give plus/minus i? Seems correct enough.

[-] Opisek@lemmy.world 5 points 1 month ago* (last edited 1 month ago)

No. The symbol √ signifies the principal square root of a number. Therefore, √x is always positive. The two roots of x, however, are ±√x. If you therefore have y²=x and you want to find y, you mustn't write y=√x, but rather y=±√x to be formally correct.

this post was submitted on 21 Aug 2025
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