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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
04-09-2011, 10:52 AM
  #476
CrAzYNiNe
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Quote:
Originally Posted by Railman View Post
His way would still be incorrect.

2a is merely a shortened form of 2a.

With a = 9+3 :

482a = 24a = 24(9+3) = 288

The issue is with people assuming that what is in front of a bracket (or variable) is part of the bracket and must be treated with the bracket as a single entity (so to speak). It isn't.
I don't agree. 2a is not the same as 2*a. We may treat it like 2*a, but 2a should stay together and not be broken up by any operator.

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Old
04-09-2011, 10:55 AM
  #477
tigidou
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Quote:
Originally Posted by Railman View Post
His way would still be incorrect.

2a is merely a shortened form of 2a.

With a = 9+3 :

482a = 24a = 24(9+3) = 288

The issue is with people assuming that what is in front of a bracket (or variable) is part of the bracket and must be treated with the bracket as a single entity (so to speak). It isn't.

Very good and you are right, I'm glad you corrected me.. Algebra (by calculating it right) actually proves its 288..


48/2a = 24a = 24(9+3) = 288.

thanks!

Still, it seems that this is a matter of convention and that not EVERYONE in the field agrees.

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Old
04-09-2011, 10:59 AM
  #478
Montreal Typical
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Quote:
Originally Posted by CrAzYNiNe View Post
I don't agree. 2a is not the same as 2*a. We may treat it like 2*a, but 2a should stay together and not be broken up by any operator.
Whether you agree is irrelevant. It is what it is.

You can take out multiplication symbols before variables or brackets, but they're still there.

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Old
04-09-2011, 11:12 AM
  #479
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Quote:
Originally Posted by HeShootsHeScores View Post
lol at this pic



By the way : 2

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Old
04-09-2011, 11:29 AM
  #480
CrAzYNiNe
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Quote:
Originally Posted by tigidou View Post
Very good and you are right, I'm glad you corrected me.. Algebra (by calculating it right) actually proves its 288..


48/2a = 24a = 24(9+3) = 288.

thanks!

Still, it seems that this is a matter of convention and that not EVERYONE in the field agrees.
Really?

48
2a

That wouldn't simplify to
24
a

??? Really?

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Old
04-09-2011, 11:32 AM
  #481
Montreal Typical
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Quote:
Originally Posted by CrAzYNiNe View Post
Really?

48
2a

That wouldn't simplify to
24
a

??? Really?
Your mistake is seeing 2a as a single entity.

You are not dividing by (2a) but by 2 then multiplying by a.

482a != 48(2a)

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Old
04-09-2011, 11:47 AM
  #482
tigidou
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Quote:
Originally Posted by Railman View Post
Your mistake is seeing 2a as a single entity.

You are not dividing by (2a) but by 2 then multiplying by a.

482a != 48(2a)

Railman, I agree with you, BUT still this is not even being agreed on in the math field (from what I understand).

If you take several Texas Instruments (different models), you'll see that they don't handle it the same. This is a convention which not everyone agrees...

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Old
04-09-2011, 01:04 PM
  #483
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2 is the answer

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Old
04-09-2011, 01:06 PM
  #484
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Quote:
Originally Posted by Railman View Post
Your mistake is seeing 2a as a single entity.

You are not dividing by (2a) but by 2 then multiplying by a.

482a != 48(2a)
if you do not put the sign you assume its a single entity
-end of line.

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Old
04-09-2011, 03:27 PM
  #485
LyricalLyricist
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Not for anything, but I got 2, and it's likely 288. I say likely cuz it's absolutely irrelevant. When you do higher math no one uses elementary symbols. They use fractions.

You would either see:

48
2(9+3)

48*(9+3)
2


This is all a pointless pissing match, because no one will ever ask you a question of the original format unless you work in an elementary school. The only place I can imagine this being an issue is for those in programming as you're forced to use / or the divide symbol, but even then, you use brackets.

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Old
04-09-2011, 03:59 PM
  #486
Bieber fever
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oh god this again ?

the correct answer is 2.

When you don't put a sign of multiplication there is a general concusses ( not a official rule ) that it implied a bracket.

so : 482(9+3) = 48[2(9+3)] = 2

But 482X(9+3) =288

simple as that...

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Old
04-09-2011, 04:21 PM
  #487
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Wait a sec...I got...WHO THE HE!! CARES??

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Old
04-09-2011, 04:24 PM
  #488
CrAzYNiNe
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Quote:
Originally Posted by HabsNation514 View Post
Wait a sec...I got...WHO THE HE!! CARES??
people like myself and others who uses math everyday, whether school, or career. We all would like to know.

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Old
04-09-2011, 04:29 PM
  #489
Ginu
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I have a PhD in Communications Engineering.

48/2a != 48/(2a)

48/2a means 48 is divided by 2 and the result is multiplied by a. There IS a convention that, if 2a is a single quantity, then it will be written as 48/(2a). Math is not built on the foundation of ambiguity. There are strict rules that have to be followed. If things were so willy nilly, we'd see all technology self-destruct randomly all over the world. Math is the basis for everything. There are set ways that you do things.

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Old
04-09-2011, 04:30 PM
  #490
Bieber fever
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to people who thinks it's 288 :


xyxy= y^2

or

xyxy=1

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Old
04-09-2011, 05:04 PM
  #491
LyricalLyricist
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Quote:
Originally Posted by hotsauce514 View Post
to people who thinks it's 288 :


xyxy= y^2

or

xyxy=1
They go with y^2. I would go for the second, but whatever.

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Old
04-09-2011, 05:19 PM
  #492
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Quote:
Originally Posted by hotsauce514 View Post
to people who thinks it's 288 :


xyxy= y^2

or

xyxy=1
There's a reason why algebra should be written on one line only. I this case it should be y^2.

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Old
04-09-2011, 05:20 PM
  #493
Fish on The Sand
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Quote:
Originally Posted by hotsauce514 View Post
oh god this again ?

the correct answer is 2.

When you don't put a sign of multiplication there is a general concusses ( not a official rule ) that it implied a bracket.

so : 482(9+3) = 48[2(9+3)] = 2

But 482X(9+3) =288

simple as that...
ummm no. When multiplying it is accepted practice to omit the operator. Even if it was a bracket, it would be a standalone bracket and would be solved by multiplying by 1 and you would still arrive at 288.

Your method would be 48/(2)(9+3). The answer to that is still 288. Under no circumstances does the 2 find its way into the bracket that contains 9+3.

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Old
04-09-2011, 05:22 PM
  #494
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xyxy= y^2

(xy)(xy)= 1


... damn you misc, damn you.

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Old
04-09-2011, 05:28 PM
  #495
DDs not undersized
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Does this thread means we are finally allowed to start a non hockey related thread?

I wanted a thread about the federal elections. Go Bloc Qubcois Go!!

Or Go (anything but Harper) Go!

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04-09-2011, 05:28 PM
  #496
Fish on The Sand
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Quote:
Originally Posted by WTFpineapple View Post
xyxy= y^2

(xy)(xy)= 1


... damn you misc, damn you.
to me they should both be 1, what is the rational for y^2?

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04-09-2011, 05:30 PM
  #497
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Quote:
Originally Posted by Fish on The Sand View Post
to me they should both be 1, what is the rational for y^2?
x*y/x*y = x/x*y*y = y^2

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Old
04-09-2011, 05:32 PM
  #498
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Quote:
Originally Posted by Fish on The Sand View Post
to me they should both be 1, what is the rational for y^2?
standard order of operations.

xyxy= y^2
-------------
x*y= xy
x*yx=y
y*y= y^2

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Old
04-09-2011, 05:41 PM
  #499
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Quote:
Originally Posted by WTFpineapple View Post
xyxy= y^2

(xy)(xy)= 1


... damn you misc, damn you.
simple clear not ambigious


But i read about the possibility of the answer 2. Yes it is possible, but its the lazy way.
some people made a convention so they do not put * or (). as a software engineer who always work with TI voyage 200, I'm happy that you need to put bracket (if more than 1 item)to make it Clear.

That way, you are sure that you are not doing wrong. Everyone will understand.
Those who took 2 and rejected 288, hope your not working on critical systems (laser treatment, medicinal machines...) hope you dont omit brackets

100% of the people must agree that the answer CAN be 288 with the BEMDAS rule (well documented), vs the value 2.
the value 2, I saw no rule or link explaining.

1 tried to explain. but he said, "(And please do not send me an e-mail either asking for or else proffering a definitive verdict on this issue. As far as I know, there is no such final verdict. And telling me to do this your way will not solve the issue!)".
http://www.purplemath.com/modules/orderops2.htm

IMO, its only some lazy anarchist that created this "rule"

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Old
04-09-2011, 05:52 PM
  #500
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Quote:
Originally Posted by Fish on The Sand View Post
ummm no. When multiplying it is accepted practice to omit the operator. Even if it was a bracket, it would be a standalone bracket and would be solved by multiplying by 1 and you would still arrive at 288.

Your method would be 48/(2)(9+3). The answer to that is still 288. Under no circumstances does the 2 find its way into the bracket that contains 9+3.
Please could you give me the reference of where you found that it is standard practice to omit the operator. Have you considered multiplication by juxtaposition. What do you mean by saying the 2 does not find it's way into the bracket?

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