aechmea Posted October 27, 2024 Posted October 27, 2024 9 hours ago, sir sanders zingmore said: Usual symbol for power is ^ Usual symbol for multiplication is *. 8*2 = 16 8^2 = 64 honestly can we argue about vinyl vs digital, it’s much more fun Yes indeed ^ is the symbol for power used in Excel. I slipped into my formative IT mode where ** is the symbol used in Fortran.
aechmea Posted October 27, 2024 Posted October 27, 2024 (edited) OT Since I mentioned Fortran ... In 1970-ish, I can remember having a 300-400 page book from IBM having the Fortran subroutine code to calculate all sorts of numerical functions. I have no idea, but it would not surprise that they became the genesis for Excel's function set; same sort of stuff. Edited October 27, 2024 by aechmea 1
bob_m_54 Posted October 27, 2024 Posted October 27, 2024 (edited) whether you write it as 8÷2(2+2)= or 8/2(2+2)= or 8 2(2+2) It equals 1 or 16... Edited October 27, 2024 by bob_m_54 1
aechmea Posted October 28, 2024 Posted October 28, 2024 On 27/10/2024 at 10:04 PM, Addicted to music said: Is he? https://www.google.com/search?cs=0&sca_esv=12c32a9e01a03173&sxsrf=ADLYWIKcMh4BBIbUH9lrYI7x7sBHnY44-A:1730025761476&q=What+is+the+BODMAS+rule+in+Australia%3F&sa=X&ved=2ahUKEwj3odGXsK6JAxWP-DgGHb2QIXIQzmd6BAgEEAY&biw=1680&bih=962&dpr=2 It stipulates that calculations in brackets must be made first, followed by calculations involving indices (powers, exponents), then multiplication and division (working from left to right), and lastly, addition and subtraction (also in order from left to right). Note the order of muliplication and division.....and not division and multiplication.... Google it and youll get it stated both ways,. Yes you will get 16 if you use a calculator or a program or app thats not taken the above in consideration. Note also that any calculator or program will be influence on whats been typed 1st. And then you see a Post above comes to 1 with a Casio calculator.... Yes, I am right. It has been this way for 400 years. You are in fact agreeing. Look at your own words which I have highlighted. In your example when you are left with a divide and a multiply (which are considered equal precedence) having first done the parentheses, working from left to right, the first operator that you come across is the divide, so you do the divide first. The final answer is 16. It really is that easy. 2
Addicted to music Posted October 29, 2024 Author Posted October 29, 2024 (edited) 8 hours ago, aechmea said: Yes, I am right. It has been this way for 400 years. You are in fact agreeing. Look at your own words which I have highlighted. In your example when you are left with a divide and a multiply (which are considered equal precedence) having first done the parentheses, working from left to right, the first operator that you come across is the divide, so you do the divide first. The final answer is 16. It really is that easy. I’ll accept both answers, it’s the way it’s BODMAS or BOMDAS or what ever you want to call it is interpreted. And how you were taught. As I said the phone and all current Apps will be 16. The Sharp and Casio will show a 1; see the pic provided. It’s not that it’s written poorly it’s how you were taught to interpret the instructions, this also applies to machine coding For someone who write/wrote Fortran would have an understanding in both basic maths and machine coding. I’ve also program in Fortran when I was in high school, never used it since. Then I use to code in Hex to design logic circuits using Boolean Algebra. You’ll need calculus to work out phase angles in current on AC voltages. But I haven’t done any of it since my college days, ever since I’ve been at work. Edited October 29, 2024 by Addicted to music
Mining Man Posted October 29, 2024 Posted October 29, 2024 The equation is deliberately ambiguous to increase engagement in the social media posts in which it appears. Why are the division and addition signs used, but the multiplication sign omitted? If you replace (2+2) with x, then the equation would become 8÷2x=? Most people would reduce this to 4/x. Extending this logic, the answer is 1. Whether it's correct comes down to what the author intended by leaving out the multiplication sign. If it was a mistake, then the answer is 16. If it was deliberate, then the answer is 1, or the author is a complete bastard. 2
Volunteer sir sanders zingmore Posted October 30, 2024 Volunteer Posted October 30, 2024 1 hour ago, Mining Man said: The equation is deliberately ambiguous to increase engagement in the social media posts in which it appears. Why are the division and addition signs used, but the multiplication sign omitted? If you replace (2+2) with x, then the equation would become 8÷2x=? Most people would reduce this to 4/x. Extending this logic, the answer is 1. Whether it's correct comes down to what the author intended by leaving out the multiplication sign. If it was a mistake, then the answer is 16. If it was deliberate, then the answer is 1, or the author is a complete bastard. the multiplication sign is implied/redundant 8÷2(2+2) is exactly the same as 8÷2X(2+2) and 8÷2*(2+2)= 2
Volunteer sir sanders zingmore Posted October 30, 2024 Volunteer Posted October 30, 2024 16 minutes ago, sir sanders zingmore said: the multiplication sign is implied/redundant 8÷2(2+2) is exactly the same as 8÷2X(2+2) and 8÷2*(2+2)= Just to be clear, implied/redundant = implied ÷ redundant 2
Mining Man Posted October 30, 2024 Posted October 30, 2024 15 minutes ago, sir sanders zingmore said: the multiplication sign is implied/redundant 8÷2(2+2) is exactly the same as 8÷2X(2+2) and 8÷2*(2+2)= The omission of the multiplication sign is a mistake, or intentional. If it's a mistake, then you are correct. If it's intentional, then you'd have to ask the author why. My explanation seeks to explain, other than for an act of bastardry, why the author would have intentionally omitted the multiplication sign? The best explanation I can think of is that it infers that 2(2+2) is to be read as the denominator beneath 8, in an equation that could only be expressed on a single text line. The obvious response is why not use brackets? Because, they are a bastard...
betty boop Posted October 31, 2024 Posted October 31, 2024 (edited) On 30/10/2024 at 11:31 AM, Mining Man said: The omission of the multiplication sign is a mistake, or intentional. If it's a mistake, then you are correct. If it's intentional, then you'd have to ask the author why. the author meant to mislead ... its a poor equation according to maths professor.. i'll ask my wife she is a maths major On 30/10/2024 at 9:56 AM, Mining Man said: The equation is deliberately ambiguous to increase engagement in the social media posts in which it appears. yep ! Edited October 31, 2024 by betty boop
~Spyne~ Posted November 4, 2024 Posted November 4, 2024 Love the discussion. 8 ÷ 2 (2 + 2) = 16. Following BOMDAS/BODMAS, do the brackets first: (2 + 2) = 4 So now you have 8 ÷ 2 (4) ≡ 8 ÷ 2 x 4 Division and multiplication have equivalent priority, so do the maths left to right 8 ÷ 2 = 4 4 x 4 = 16 This page gives an explanation as to why so many people come to an answer of 1.
Cloth Ears Posted November 5, 2024 Posted November 5, 2024 Just shows the issues you get when blindly following a formula instead of working stuff out from first principles. In algebra, multiplication and division are essentiall the same thing, so it doesn't matter what order you do the in. Same with addition/subtraction... 1+1-1+1 is the same as +1+1-1+1 is the same as -1+1+1+1 Multiplication and division... 2*2/2*2 is the same as 2/2*2*2 is the same as 2*2*2/2 Only braces can get in the way of this. And exponents - except that you can simply think of them as an additional multiplication step (2^4 = 2*2*2*2 = 16) So, the original problem - 8/2(2+2) or 8/2*(2+2) equals 8/2*4 (or 8*4/2) and it thus 16.
aechmea Posted November 5, 2024 Posted November 5, 2024 The problem is with the acronym BODMAS (or BOMDAS or whatever) itself. Like some acronyms/mnemonics/short cuts/memory jogs it falls short on telling the whole story and therefore leads to mis-interpretation. It does not clearly show that multiplication and division (and addition and subtraction) are of equal precedence. It falsely implies that M is done before D (or D before M depending upon which ever acronym you use). And it does not show at all that M & D operations (and A & S) are done from left to right. 1
bob_m_54 Posted November 6, 2024 Posted November 6, 2024 3 hours ago, doogie44 said: Wait until you guys get to calculus! Easy, dental hygienist will sort that out for you.. 2
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