 posted ago by ago by +43 / -0
sorted by:
13 points ago +14 / -1
6 points ago +6 / -0

Its what the answer Identifies as

11 points ago +11 / -0

Shit I was an A student in math and i'm struggling to remember the proper sequence, parentheses first right? So its 9? Go ahead and shred me if I'm wrong

4 points ago +5 / -1

6/2(2+1)= 6/2x3= 3x3= 9

P. E. M/D. A/S. M & D , and A / S, neither takes precendence- is done from left to right

5 points ago +6 / -1

Yes it is 9

1 point ago +7 / -6

SHRED

Parentheses are indeed first, but that doesn't result in 9.

9 points ago +9 / -0

(1+2) = 3 M'kay

6÷2 = 3 M'Kay

3*3 = 9

2 points ago +2 / -0

The video is wrong

In the first step the the parenthesis goes away

6 ÷ 2(1+2)

(without the multiplication shorthand) 6 ÷ 2*(1+2)

6 ÷ 2 * 3

3 points ago +6 / -3

So then I guess 1?

3 points ago +5 / -2

UNSHRED

3 points ago +3 / -0

If you type it in a calculator it says 9?

3 points ago +3 / -0

Depends how you type it in. I'm with u/cyberrigger :

6
---------- = 1
2(1+2)

Which should go into a spreadsheet cell or a calculator as:

6/(2(1+2))

2 points ago +2 / -0

put 4 spaces at the beginning of each line to draw pictures.

2 points ago +2 / -0

I do it differently (three spaces at the end of each line). Finally fixed the formatting on my second comment containing the equation. Not sure why it worked on the first try in my previous comment.

0 points ago +2 / -2

Walk of shame 😕

1 point ago +2 / -1

Wrong

9 points ago +9 / -0
11 points ago +11 / -0

please excuse my dear aunt sally

9 points ago +9 / -0

The really old-school math might write this as

``````    6
----------   = 1
2(1+2)
``````

The sequential interpretation (text string) came out with the parsing algorithms of computer languages such as FORTRAN.

3 points ago +4 / -1

Ugh. This makes me sad. I'm only 34, but how you have the problem laid out is exactly how I was taught to do this sort of thing. My answer is 1 and now I feel old.

To note though, after I got out of 8th grade, we weren't allowed to use either the diagonal symbol / or the substitute ÷ to denote division. It was officially prohibited in my classes because of the confusion about the order of operations and the issue of textbooks not properly using parentheses (which happened frequently enough to be a problem) to convey which parts of the equation were supposed to be divided by something else. If anyone used those two symbols, their answer was automatically marked wrong and if the textbook used that notation, we were told to skip it. Usually the teachers made sure to check problems before assigning them, but some slipped through.

We HAVE to use the horizontal "fraction" symbol to denote division even in my college math classes (I'm a non-traditional student, long story) now. The profs I've had said it helps with keeping things neat, clean, and legible. Spotting figures that cancel eachother out is much easier with this notation too. I have no idea how someone would do the handwritten college level math with a ÷ or / being used in their work. Granted, I haven't tried, but thinking about what that would look like written out is irritating already.

1 point ago +2 / -1

I have no idea how someone would do the handwritten college level math with a ÷ or / being used in their work

For computer parsing it would be.

6 ÷ (2(1+2))

or

6 / (2(1+2))

or

6 ÷ 2*(1+2)

or

6 / 2*(1+2)

3 points ago +3 / -0

That's why I said handwritten. You CAN find a way to make this equation clear with an abundance of parentheses and conscious effort for a computer to evaluate for you, sure. But for actually solving the problems myself, by hand, on paper for something like calculus series math, this notation of / and ÷ is an unfiltered nightmare.

The first thing that continually comes to mind is the cancelation issue like I said. It's harder, for me anyway, to see if something like an (x+3) is in both the numerator and denominator if it's beside itself and spaced out with other figures between instead of one over top of the other. It's also harder for me to quickly tell if an extra (x+3) is actually part of the denominator or not.

2 points ago +2 / -0

Yep

6 points ago +6 / -0

Common core.

3 points ago +3 / -0

Ah. You're smart.

"Remember in seventh grade when you were discussing the order of operations in math class and the teacher told you the catchy acronym, “PEMDAS” (parenthesis, exponents, multiplication, division, addition, subtraction) to help you remember? Memorable acronyms aren't the only way to memorize concepts."

6 points ago +7 / -1

Computer Engineer here, the answer is 9 and here's how calculators and computers solve this problem.

--

The problem is an order of operations trick so Reverse Polish Notation aka PostFix Notation is the clearest notation for order of operations. Numbers are ordered first with operands trailing.

6 2 / 1 2 + * = 9

--

This allows the computer to sequentially add the numbers to the stack and execute when an operand is read.

Here 6 and 2 are on the stack before 1 and 2, so this operation has priority when the first operand is reached. There computation result remains on the stack so we get 6 2 / = 3.

3 1 2 + *

1 and 2 are now at the top of the stack so they are added as 1 2 + = 3.

Then the two remaining results are...

3 3 * which is 9

4 points ago +4 / -0

Math and computer science major here, and you sir are correct

1 point ago +2 / -1

What if you solve it algebraically? 6÷2(x+y)? You get two answers 3x+3y and 3/(x+y). So divide both sides by 3, you get (x+y)=1/(x+y). Computer vs algebra. Plug in the numbers, 3=1/3. Which means there are no solutions. The correct answer is it's a poorly written expression, and it was designed that way by the creator.

2 points ago +2 / -0

That is incorrect, you need to proportionally increase x and y by the amount in the original problem.

0 points ago +1 / -1

Nah it's right. I could do it another way to show how the OP expression is a rearrangement of formula x^2+x-6=0. One where they substituted x with 2, ignored the second negative value of x, which is -3. Thus the OP expression became 6÷2(1+2). What does that equal? 1.. If you sub -3, for 2. The answer is 1. It's a fucked up way to show that they got their 'viral' math problem from the formula x^2+x-6=0 and tried to trick people by writing it in a weird way and if they do the order of operations incorrectly they get 9.

6 points ago +8 / -2

The only acceptable answers are 9 and 1. 9 being the actual correct answer. One being acceptable because I've been in a school before that taught the simplification needs to be finished before moving onto the division. The simplification would include multiplying 2x3 before moving onto the division if that makes any sense

4 points ago +6 / -2

1 point ago +2 / -1

Debbie Does Dallas! 😂

3 points ago +4 / -1

9

3 points ago +3 / -0

TBH this one comes down to what kind of school you had and what kind of teacher.

This is a reflection of government funded schools and parent's involvement in education. I was in school in the 90's and I solved it wrong with my answer being 1.

Spell checker is my best friend or y'all would think I was writing in an alien language.

3 points ago +3 / -0

I was in school long before that, and the answer was 1. But the problem shouldn't be written the way it is in the post title. It should be written either:

6
---------- = 1
2(1+2)

or

6/(2(1+2))

The latter being how you would type it into a regular (not Reverse Polish Notation) calculator, or into a spreadsheet cell.

But of course, ultimately, it depends on what the problem is intended to represent. If the answer is really supposed to be 9, it would go into a spreadsheet cell as =(6/2)*(1+2)

3 points ago +3 / -0

I wasn't the sharpest crayon in the shed but wtf even I know this. It's 69 without the 6.

3 points ago +3 / -0

3 points ago +3 / -0

3 points ago +3 / -0

I must admit I'm interested in how they got some of those answers more than others. 7...?

2 points ago +2 / -0

They subtracted 6 from 2 and added 3

2 points ago +2 / -0

I mean 2 from 6 duh

3 points ago +3 / -0

That's thanks to our lovely Dept of Edumacation. Also - MATH BE WACIST

3 points ago +4 / -1

It’s honestly just a poorly written equation. You should be explicit with parentheses rather than just relying on convention. Answer could be 9 or 1 and I realize by convention it is 9.

2 points ago +2 / -0

I was taught BEDMAS and I'm getting different answer

2 points ago +3 / -1

Division and Multiplication are equally weighted and must be done in order from left to right, as is Addition and Subtraction (after you've calculated all the other higher priority stuff).

[S] 2 points ago +2 / -0

BEDMAS is the same as PEDMAS, the B just means brackets instead of parentheses.

2 points ago +3 / -1

With common core, kids don’t even see this equation.

1 point ago +2 / -1

Maths are Raycist

1 point ago +4 / -3
1 point ago +2 / -1

But I bet they can recite all 72 genders by heart