Comment on teachings

• UnRelatedBurner@sh.itjust.works ⁨8⁩ ⁨months⁩ ago

  Uhm, actually 🤓☝️!

  Afaik sqrt only returns positive numbers, but if you’re searching for X you should do more logic, as both -3 and 3 squared is 9, but sqrt(9) is just 3.

  If I’m wrong please correct me, caz I don’t really know how to properly write this down in a proof, so I might be wrong here. :p
  (ps: I fact checked with wolfram, but I still donno how to split the equation formally)

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  • criitz@reddthat.com ⁨8⁩ ⁨months⁩ ago

    You’re correct. The square root operator only returns the principal root (basically, the positive one).

    So if x ^2^ = 9 then x = ±√9 = ±3

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    • UnRelatedBurner@sh.itjust.works ⁨8⁩ ⁨months⁩ ago

      Thanks, I haven’t connected the dots to that (±) sign and this problem.

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    • Routhinator@startrek.website ⁨8⁩ ⁨months⁩ ago

      Image

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      So I checked this on my smartphone first, and thought maybe the software is just shit… So then I checked it on a Casio scientific calc, and both agree.

      -3^2 = -9… And 9 != -9

      … Are all the calculators somehow wrong? What’s the math rule I’m forgetting here…

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      • criitz@reddthat.com ⁨8⁩ ⁨months⁩ ago

        I think your calculator is interpreting that as -(3^2) and not (-3)^2

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  • h3ndrik@feddit.de ⁨8⁩ ⁨months⁩ ago

    |x| = sqrt(…)

    would be correct.

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    • UnRelatedBurner@sh.itjust.works ⁨8⁩ ⁨months⁩ ago

      Cool! Makes sense to me. Honestly, I’ve never done it this way, but it’s so clean. Love it. Thanks.

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• Evil_Shrubbery@lemm.ee ⁨8⁩ ⁨months⁩ ago

  Fund the sqrter!

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• Kusimulkku@lemm.ee ⁨8⁩ ⁨months⁩ ago

  Sqrt

  hehe

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