• moriquende@lemmy.world
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    4 days ago

    But factorised terms are multiplications, so they’re still following the same rules: a(b+c) = a*(b+c)

    Example: 2(3+5)=16, and also 2*3+2*5=16

    • 💡𝚂𝗆𝖺𝗋𝗍𝗆𝖺𝗇 𝙰𝗉𝗉𝗌📱@programming.dev
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      4 days ago

      But factorised terms are multiplications,

      No, they’re Distribution done in the Brackets step, a(b+c)=(ab+ac), now solve (ab+ac)

      a(b+c) = a*(b+c)

      Nope! a(b+c)=(ab+ac). 1/a(b+c)=1/(ab+ac), but 1/ax(b+c)=(b+c)/a.

      23+25=16

      (2x3+2x5) actually, or you’ll get the wrong answer when it follows a Division sign. See previous point

          • moriquende@lemmy.world
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            3 days ago

            Yes, the math textbook says exactly what I said, that it’s a multiplication. There’s no mention of it being a separate operation taking precedence. The parentheses in your example are added for clarity.

            Whether you give priority to juxtapositions is an open debate with the consensus being to just use parenthesis around when writing in a single line to avoid confusion. However, there is no distribution step taking precedence, as you mentioned, and the whole debate centers around whether the writer was too lazy to add parenthesis.

            • Yes, the math textbook says exactly what I said, that it’s a multiplication

              Nope, they say it’s Brackets

              5(36)=(5x36) <== Brackets

              bc=(3x4) <== Brackets

              There’s no mention of it being a separate operation taking precedence

              It’s part of the Brackets step. I have no idea what “separate operation” you’re talking about

              The parentheses in your example are added for clarity

              Nope. They are there because The Distributive Law requires them. “those who study algebra are required to make their calculations conform to these laws”.

              Whether you give priority to juxtapositions is a

              A literal Law of Maths. See textbook.

              the consensus being to just use parenthesis around when writing in a single line to avoid confusion.

              No it isn’t. You won’t find any Maths textbook that says that.

              However, there is no distribution step taking precedence

              There is the Brackets step, including Distribution, taking precedence, as per Maths textbooks 🙄

              as you mentioned

              As the textbooks mention

              the whole debate centers around whether the writer was too lazy to add parenthesis

              The only debate is by people like you ignoring what is taught in Maths textbooks.

              • moriquende@lemmy.world
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                3 days ago

                Nowhere in your “proof” screenshots does it say anything about distribution being part of the brackets step. Distribution is a method that can help solve equations, but it isn’t required. If you have 2(3+5) you’re free to solve it as 2*3+2*5 or as 2*8, whichever is easiest. That is because juxtaposition means multiplication and nothing else.

                Math textbooks almost universally will either use clear brackets or simply write divisions in 2 lines, which avoids the confusion altogether.

                • 💡𝚂𝗆𝖺𝗋𝗍𝗆𝖺𝗇 𝙰𝗉𝗉𝗌📱@programming.dev
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                  3 days ago

                  Nowhere in your “proof” screenshots does it say anything about distribution being part of the brackets step

                  Which step is first? Brackets. What do they do first in 5(36)/9? The Brackets.

                  What does the other textbook do with bc? Puts it in Brackets. Which step is first in order of operations? Brackets 🙄 What do they end that page with? “those who study algebra are required to make their calculations conform to these laws”. You seriously need to work on your comprehension that I need to explicitly spell out to you what the textbooks say

                  Distribution is a method that can help solve equations

                  The Property is. The Law is a rule which literally must be obeyed, when solving expressions, as per Maths textbooks 🙄

                  it isn’t required

                  Yes it is! That’s why it’s a Law 😂

                  If you have 2(3+5) you’re free to solve it as 23+25 or as 2*8

                  Nope, neither

                  1/2(3+5)=1/(6+10)

                  1/2x3+2x5=3/2+10 WRONG ANSWER

                  1/2x8=8/2=4 WRONG ANSWER

                  Welcome to why it must be in brackets, as per Maths textbooks 🙄

                  That is because juxtaposition means multiplication and nothing else

                  says person who can’t cite any Maths textbook that says that. Nope! It means it’s a Term/Product, the result of a Multiplication (or Factorisation), and nothing else…

                  Note that it never used the word Multiplication at all in that definition 🙄

                  Math textbooks almost universally will either use clear brackets or simply write divisions in 2 lines

                  or an obelus or slash on one line

                  which avoids the confusion altogether

                  Only people who don’t remember the rules of Maths are confused about it. Students have no trouble with it.