Comment on ))<>((

FatTony@lemmy.world ⁨8⁩ ⁨months⁩ ago

• ByGourou@sh.itjust.works ⁨8⁩ ⁨months⁩ ago

  Isn’t the “-” order of operations the same as a multiply ? I think I learned powers take priority over the “-” so your calculator would be right.
  But either way if it can cause confusion you should use parentheses.

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  • TonyTonyChopper@mander.xyz ⁨8⁩ ⁨months⁩ ago

    Every calculator I’ve used has separate negative and subtraction keys for this purpose. There is no order of operations to follow, it’s just a squaring a number

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    • ByGourou@sh.itjust.works ⁨8⁩ ⁨months⁩ ago

      I learned negative as being a separate operation where we need to apply the order of operations. I think it was something like : -2 is a diminutive for -1x2 so it uses the order of operations of a multiplication.
      My calculator is the official one used in schools in France (ti-83 premium ce) and it says -2^2 = 4 with the negative key. I don’t think it would make a mistake in such a simple concept.

      But whatever these concepts can change depending on the field, country, level of education. What I mean is : it’s unclear, so use parentheses. So (-2)^2 or -(2^2) are the correct ways to write it.

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      • SmartmanApps@programming.dev ⁨8⁩ ⁨months⁩ ago

        I think it was something like : -2 is a diminutive for -1x2

        Correct. Things that are usually left out of Maths expressions are plus signs, ones as multipliers/indices, and un-needed brackets. e.g. I could more fully write this as -1(4)², but that just simplifies to -4²

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    • SmartmanApps@programming.dev ⁨8⁩ ⁨months⁩ ago

      it’s just a squaring a number

      The number being squared is 4, unless you put (-4)², otherwise it’s 4² with a minus sign.

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  • SmartmanApps@programming.dev ⁨8⁩ ⁨months⁩ ago

    I think I learned powers take priority over the “-”

    Yes, Exponents is the 2nd-highest precedence (after Brackets) - BEDMAS.

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• Ultraviolet@lemmy.world ⁨8⁩ ⁨months⁩ ago

  I would never write -n². Either ‐(n²) or (-n)². Order of operations shouldn’t be some sort of gotcha to trick people into misinterpreting you, it’s the intuitive reading of a well constructed mathematical expression.

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  • SmartmanApps@programming.dev ⁨8⁩ ⁨months⁩ ago

    Either ‐(n²) or (-n)². Order of operations shouldn’t be some sort of gotcha to trick people into misinterpreting you

    It isn’t. With ‐(n²), n² is already a single term, so the brackets aren’t needed.

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• SmartmanApps@programming.dev ⁨8⁩ ⁨months⁩ ago

  My calculator says -2² = -4

  That’s correct

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