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POLL: A simple mathematical problerm
 
Latiosmaster47  posted on Apr 08, 2011 3:00:33 PM - Report post

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quote:
originally posted by sharp911

i was taught that
if we have for eg. only number 2 before parenthesis that means we must multiply whole parenthesis by this number somethin' like this, 2(9+3) it's the same as 2*9 + 2*3 that equals 24.

You know what i mean? ;d
it was really, really hard to for meh to explain this

That's just a trick that teachers use to help their students with multiplication. If you follow the order of operations, you will get the same answer:

2(9+3)
2(12)
24

 
Rise_Against  posted on Apr 08, 2011 3:01:56 PM - Report post

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Aha I see now. So it really is dependent on the order of operations you were taught.

Thanks Neo, I'm going to show this to my maths teacher and see if she can figure it out.

 
Neo7  posted on Apr 08, 2011 3:23:44 PM - Report post

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quote:
originally posted by Rise_Against

Aha I see now. So it really is dependent on the order of operations you were taught.

Thanks Neo, I'm going to show this to my maths teacher and see if she can figure it out.

You can convert the division symbol (48 divided by 2) into a multiplication problem (48 multiplied by 0.5). Then following the same pattern used by the before operations to obtain 288. It is a valid rule since no calculations are being made (only using an identity property of multiplication and division)

The strict correct answer is that the syntax of the equation was wrong to begin with.

It boils down to how you read this:
1/2x

Do you read it as (1/2) * x or as 1/(2x). The way it was originally written does not specify the divisor in an explicit way leaving the equation ambiguous

[Edited by Neo7, 4/8/2011 3:24:59 PM]

 
kingnight2  posted on Apr 08, 2011 6:36:20 PM - Report post

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you dont even need to solve the full problem to get the answer. Only two options and you quickly learn that one is too small.
 
DABhand  posted on Apr 08, 2011 7:07:34 PM - Report post

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The answer is 2. Parenthesis definitely always comes first.

This was put on 4chan as a troll thread, so when people said 2 they would troll them into thinking it was definitely 288.

Show you what I mean.

People think its 288 which is wrong.. lets see the equation with the supposed 288 answer

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

Cross multiplication then.

48 = 288 * 2(9+3) => 48 = 288 * 24 => 48 = 6912 >.<

However

48 = 2 * 2(9+3) => 48 = 2 * 24 => 48 = 48

[Edited by DABhand, 4/8/2011 7:14:47 PM]

 
Neo7  posted on Apr 08, 2011 7:57:26 PM - Report post

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quote:
originally posted by DABhand

The answer is 2. Parenthesis definitely always comes first.

This was put on 4chan as a troll thread, so when people said 2 they would troll them into thinking it was definitely 288.

Show you what I mean.

People think its 288 which is wrong.. lets see the equation with the supposed 288 answer

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

Cross multiplication then.

48 = 288 * 2(9+3) => 48 = 288 * 24 => 48 = 6912 >.<

However

48 = 2 * 2(9+3) => 48 = 2 * 24 => 48 = 48

[Edited by DABhand, 4/8/2011 7:14:47 PM]

The thread originated from Team Liquid actually. There was quite the discussion about it there (in fact I think it's still on going)

[url]www.teamliquid.net/forum/viewmessage.php?topic_id=210235' target='_blank'>Link

 
DABhand  posted on Apr 08, 2011 8:16:15 PM - Report post

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Imagine it as this

48÷2(9x+3x)= 0

The parenthesis has to be worked out first

48÷18x+6x= 0
48÷24x= 0
48=24x
2=x


Even without working out the Parenthesis first

48÷2(9x+3x)=0
48÷2=(9x+3x)
24=12x
2=x

[Edited by DABhand, 4/8/2011 8:18:05 PM]

 
Skyheart  posted on Apr 08, 2011 9:16:14 PM - Report post

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Throwing my vote in with 288. Good old BODMAS (our English version or the order - Brackets Over Division, Multiplication, Addition and Subtraction).

When you hear hoofbeats, don't think Zebra.

EDIT: Fixed :P

[Edited by moderator DABhand, 4/8/2011 9:18:08 PM]

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