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What's the answer to this equation?

View Poll Results: The answer is...
2 101 42.08%
288 139 57.92%
Voters: 240. You may not vote on this poll

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Old
04-07-2011, 03:15 PM
  #51
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It's 288 and it's simple algebra.

You do multiplications prior to add/subtractions. Since the (9+3) is in brackets might as well just call it 12

The question in reality is 24 x 12

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04-07-2011, 03:15 PM
  #52
llamateizer
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Quote:
Originally Posted by WTFpineapple View Post
I just did it on my GRAPHIC calculator. Gives me 288.
I did it with my TI voyage 200!!

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Old
04-07-2011, 03:16 PM
  #53
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Quote:
Originally Posted by jbeck5 View Post
But you're supposed to eliminate the bracket by multiplying it with what is directly beside it outside the bracket.

2(9+3)=24 not 2x12.
Opinion or do you have a source for that rule?

I'm not aware of any such law in mathematics; it's definitely not part of Order of Operations.

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04-07-2011, 03:17 PM
  #54
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Quote:
Originally Posted by bobbyflex View Post
no he's not. The brackets only apply when there's an equation in it

once the 9+3 is solved the equation becomes:

48 / 2 * 12

going left to right the answer is 288, not 2
This guy has it right. Only the equation IN the bracket comes first. So it is basically this: 48/2 * 12, giving you 24*12=288

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Old
04-07-2011, 03:18 PM
  #55
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Quote:
Originally Posted by bobbyflex View Post
no he's not. The brackets only apply when there's an equation in it

once the 9+3 is solved the equation becomes:

48 / 2 * 12

going left to right the answer is 288, not 2
When there's a bracket, you distribute the multiplier inside it, 2(9+3) is (18+6)
48/(18+6) = 2

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04-07-2011, 03:18 PM
  #56
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Quote:
Originally Posted by Dirty Danglez View Post
lol Division and Multiplication don't take precedence over the other. Some learned BEDMAS (Brackets exponents division multiplication addition subtractions), others learned PEMDAS (Paranthesis, exponents, Multiplication, division, addition, subtraction).

I got 2, but now am Confused... is going left to right actually a rule in the case of Multiplication and division? Never heard that before.
I only bolded it to explain the rule in case people didn't know. And yea, it goes from left to right when dealing with division/multiplication only.

Almost sure the answer is 288, still.

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04-07-2011, 03:20 PM
  #57
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the answer is 288 by using BEDMAS and applying DIVISON before MULTIPLICATION (going left to right using BEDMAS)

48/2(9+3)
Brackets First
48/2(12)
Division Next
24(12)
Finally Multiplication
288


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Old
04-07-2011, 03:21 PM
  #58
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Quote:
Originally Posted by MoMo316 View Post
When there's a bracket, you distribute the multiplier inside it, 2(9+3) is (18+6)
48/(18+6) = 2
Nah, it's not like that.

It's 48/2 | (9+3). Multiplying 2 x 9 would break the Order of Operations.

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04-07-2011, 03:21 PM
  #59
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Quote:
Originally Posted by StanAjax View Post
It says there's an error and wants to add a multiplication sign between 2 and the opening bracket. When I click on OK, it answers 288, which is the correct answer.
Which is why people keep getting 2. This "rule" that you have to multiply the number outside the bracket before the other multiplication/division is simply not real. Technically speaking 2(9+3) is not a real term. There is no operator between the 2 and the bracketed components, so there is no way to know what operation you have to perform. It's simply a common shorthand convention that you reduce 2*(9+3) to 2(9+3) with multiplication implied.

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04-07-2011, 03:21 PM
  #60
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I don't know if people are intentionally trying to embarrass themselves, and I consider myself terrible at math by the way, one of my worst subjects and all and no I'm not one of those people where 85% is my worst subject, terrible student here:

48÷2(9+3)
48÷2(12)
aka
48÷2 x 12
24 x 12

You do brackets first, then you do it in order because it's all multiplication/division at this point 2(12) means 2 x 12

I can't believe a ton of people on the net are honestly having trouble with this question.

Quote:
Originally Posted by My Sweet Shadow View Post
Which is why people keep getting 2. This "rule" that you have to multiply the number outside the bracket before the other multiplication/division is simply not real. Technically speaking 2(9+3) is not a real term. There is no operator between the 2 and the bracketed components, so there is no way to know what operation you have to perform. It's simply a common shorthand convention that you reduce 2*(9+3) to 2(9+3) with multiplication implied.
Exactly! Someone who actually gets it. I honestly consider myself average intelligence + below average in math. It's kind of shocking me that so many people could get this wrong or be so certain that 2 is the correct answer.

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Old
04-07-2011, 03:21 PM
  #61
llamateizer
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Quote:
Originally Posted by MoMo316 View Post
When there's a bracket, you distribute the multiplier inside it, 2(9+3) is (18+6)
48/(18+6) = 2
NO

The standard order of operations, or precedence, is expressed in the following chart.
terms inside brackets
exponents and roots
multiplication and division
addition and subtraction

you have to eliminate barket.
you begin with terms inside brackets.

48 / 2 * (9 + 3 )
48 / 2 * (12)

Bracket is eliminated
48 / 2 * 12
if you wanted to get 2

it should've be

48 / ( 2 * ( 9 + 3 ) )

then you'd get 2

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Old
04-07-2011, 03:21 PM
  #62
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Quote:
Originally Posted by MoMo316 View Post
When there's a bracket, you distribute the multiplier inside it, 2(9+3) is (18+6)
48/(18+6) = 2
But the multiplier isn't 2, it's 48/2.

In the end it goes like this

24 (9+3)

=(216 + 72)
=288

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Old
04-07-2011, 03:21 PM
  #63
JeffMangum
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Oh, and PEMDAS > BEDMAS.

Just sayin'.

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04-07-2011, 03:23 PM
  #64
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Actually no one is wrong om the priorities here, it's just hard to visualize it when it's written linearly. If it's :

48
------- = 2
2(9+3)

if it's

48
----- (9+3) = 288
2

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04-07-2011, 03:23 PM
  #65
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Quote:
Originally Posted by MoMo316 View Post
When there's a bracket, you distribute the multiplier inside it, 2(9+3) is (18+6)
48/(18+6) = 2
Step 1: Dividing by two is equivalent to multiplying by 1/2 or 0.5
Step 2: 48÷2(9+3) = 48*0.5(9+3)
Step 3: 48*0.5(12) = 48*(4.5+1.5)
Step 4: 48*0.5(12) = 48*(4.5+1.5) = 48*6 = 288
Step 5: Answer = 288
Step 6: Profit.

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04-07-2011, 03:25 PM
  #66
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Quote:
Originally Posted by MoMo316 View Post
Actually no one is wrong om the priorities here, it's just hard to visualize it when it's written linearly. If it's :

48 = 2
-------
2(9+3)

if it's

48
----- (9+3) = 288
2
This is right, it is badly written. however you must use the bolded one.

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04-07-2011, 03:25 PM
  #67
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04-07-2011, 03:25 PM
  #68
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Quote:
Originally Posted by My Sweet Shadow View Post
Which is why people keep getting 2. This "rule" that you have to multiply the number outside the bracket before the other multiplication/division is simply not real. Technically speaking 2(9+3) is not a real term. There is no operator between the 2 and the bracketed components, so there is no way to know what operation you have to perform. It's simply a common shorthand convention that you reduce 2*(9+3) to 2(9+3) with multiplication implied.
Yep, I really don't understand how 50% of people can get confused on this one.

I'm going to try it on my girlfriend though.

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04-07-2011, 03:25 PM
  #69
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Quote:
Originally Posted by MoMo316 View Post
Actually no one is wrong om the priorities here, it's just hard to visualize it when it's written linearly. If it's :

48 = 2
-------
2(9+3)

if it's

48
----- (9+3) = 288
2
That's essentially the point, and I am unsure if 2(9+3) is the same as 2*(9+3) in terms of order of operations. However, wolfram says the answer would be 288, and i trust them. I would've gone with 2 myself though.

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Old
04-07-2011, 03:26 PM
  #70
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Quote:
Originally Posted by MoMo316 View Post
Actually no one is wrong om the priorities here, it's just hard to visualize it when it's written linearly. If it's :

48 = 2
-------
2(9+3)

if it's

48
----- (9+3) = 288
2
Dude these are the types of problems (except even harder) that they'd give us in school all the time. Who cares how it's written, it's a pretty simple math problem regardless. The way it's written to me is pretty clear, I don't see why other people don't see it that way. Again I have to stress that Math is by far one of my worst subjects and I'm a barely passing student in my school days. Plus I haven't been to school in like 7 years. I still can't believe the way it's written confuses so many people. If you aren't getting 288 then clearly the people who aren't wrong about the priorities aren't in fact using them correctly.

You just follow the rules and it's pretty clear imo. Now if you want to get started talking about Logs and all that, people here would make me look like an infant haha.

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04-07-2011, 03:27 PM
  #71
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Quote:
Originally Posted by MoMo316 View Post
When there's a bracket, you distribute the multiplier inside it, 2(9+3) is (18+6)
48/(18+6) = 2
you're wrong bro. That would apply if the equation was:
48 / [2(9+3)] = 2

but the equation is:
48 / 2(9+3)
= 48 / 2 * (9+3)
= 48 / 2 * 12
= 24 * 12
= 288

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Old
04-07-2011, 03:27 PM
  #72
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Quote:
Originally Posted by Danadiens View Post
This is right, it is badly written. however you must use the bolded one.
Ok well It's 288. I read the OP as the non-bolded one.

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Old
04-07-2011, 03:27 PM
  #73
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Quote:
Originally Posted by LyricalLyricist View Post
That's essentially the point, and I am unsure if 2(9+3) is the same as 2*(9+3) in terms of order of operations. However, wolfram says the answer would be 288, and i trust them. I would've gone with 2 myself though.
2*(9+2) means 2(9+2) all it is really is a simplified way of saying the same thing.

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04-07-2011, 03:27 PM
  #74
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Originally Posted by husamus156 View Post

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04-07-2011, 03:29 PM
  #75
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Quote:
Originally Posted by LyricalLyricist View Post
That's essentially the point, and I am unsure if 2(9+3) is the same as 2*(9+3) in terms of order of operations. However, wolfram says the answer would be 288, and i trust them. I would've gone with 2 myself though.
2(9+3) is just sloppy writing of 2*(9+3). There's no such mathematical thing as an invisible operator equivalent to a multiplication but making it higher priority than other multiplication/division.

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