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6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]

 
Person445
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01/22/2013 10:54 AM

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6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]


Hopefully this will end this debate.

The other OP removed this video from his thread as the answers differed.

This is from a math professor and a very well respected one at that.

***UPDATE***

I received this e-mail from Dr. Stein about 20 minutes ago


Russell,

I just researched this in several places, AND I'M WRONG!!! I'd appreciate it if you posted this answer. Here's a nice explanation.

[link to chilimath.com]

While the acronym PEMDAS is correct, the problem comes with the confusion about how M and D are treated.

I have always thought that it meant that M (multiplication) is to precede D (division). On reading several sources, M and D are treated at the same level of hierarchy, and are to be done left to right.

In other words, 6/2 x 3 really is 9, because M and D are at the same hierarchy level, and so M no longer PRECEDES D, but should be done left to right. The division is encountered first in reading 6/2 x 3, and so is done first.

Jim


***2nd e-mail update***

Hi Russell,

One of the things that I've always believed is that one should admit to one's mistakes. I just made one, and the important thing is to get it right.

Most mathematicians are aware of the possibility of error in such a situation (I'm willing to bet I'm not the only mathematician who would make this mistake). As a result, they will usually parenthesize to avoid potential misinterpretation. For instance, I would write the problem as either

6 / (2(1+2)) if I wanted the answer to be 1

or

(6/2) (1+2) if I wanted the answer to be 9

Last Edited by Person445 on 01/22/2013 12:23 PM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]


Both answers are possible according to this professor. The equation is not properly written.
Anonymous Coward
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01/22/2013 11:12 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]


The problem is written unconventionally
Dr. Charles Norris

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01/22/2013 11:12 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
about time someone clears this up...

now all the "9" sayers can.............

stfu
Forgotten

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01/22/2013 11:15 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
So the "professor" in the vidoe came back and admitted he was wrong? He says the answer is 9.


Ok, got it. Answer is 9.

Last Edited by Forgotten on 01/22/2013 03:18 PM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]


Both answers are possible according to this professor. The equation is not properly written.
 Quoting: Anonymous Coward 32797587


Guy says both answers are correct at the end??
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Person445 (OP)
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01/22/2013 11:17 AM

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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]


Hopefully this will end this debate.

The other OP removed this video from his thread as the answers differed.

This is from a math professor and a very well respected one at that.
 Quoting: Person445



I can make a video of 3 math professors at my college saying something different.
 Quoting: Forgotten


Well you do that and then post it here.

Last Edited by Person445 on 01/22/2013 11:19 AM
Dr. Charles Norris

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01/22/2013 11:18 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]


Hopefully this will end this debate.

The other OP removed this video from his thread as the answers differed.

This is from a math professor and a very well respected one at that.
 Quoting: Person445



I can make a video of 3 math professors at my college saying something different.
 Quoting: Forgotten


please do.....

because....P, E, M, D, A, S....has ALWAYS been the proper way to solve algebra....

I've never known any math professor to teach anything but that order of operation...
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01/22/2013 11:18 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]


Hopefully this will end this debate.

The other OP removed this video from his thread as the answers differed.

This is from a math professor and a very well respected one at that.
 Quoting: Person445



I can make a video of 3 math professors at my college saying something different.
 Quoting: Forgotten


Berkeley professor better than community college professors
Person445 (OP)
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01/22/2013 11:19 AM

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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
I'd be very interested in how a graduate of Yale University and a tenured professor of Mathematics would answer this incorrectly.
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01/22/2013 11:21 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
[link to www.youtube.com]


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01/22/2013 11:22 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]


Both answers are possible according to this professor. The equation is not properly written.
 Quoting: Anonymous Coward 32797587


Guy says both answers are correct at the end??
 Quoting: Forgotten


what he is saying is that parenthesis always goes 1st.....

It's the order in which you must solve algebra problems.

Parentheses ( )
Exponents 3º (the smaller number on the upright)
Multiplication •, *, x
Division /
Addition +
Subtraction -

without this simple order algebra simply does not work.

it is the 1st thing you are taught in algebra 101
Rockarchy

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01/22/2013 11:23 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
mindisfulloffuck

Last Edited by Rockarchy on 01/23/2013 01:10 PM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
The ambiguity should be cleared up by adding more brackets, because many say the operator presedence is BODMAS or BEDMAS:

[link to www.mathsisfun.com]
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01/22/2013 11:25 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
Of course it's 1, I can't even understand how someone can get 9...
 Quoting: Rockarchy


it comes out as nine if you use the other order of operations, which is widely accepted and also taught at many other schools.

I consider color to be mispelt, it should be colour. but that is just linguistic difference.

I can fully understand how some consider the answer 1 and some 9.

I answer it as 9.
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01/22/2013 11:28 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
In fact op video the professor is wrong.

BEMDAS and BEDMAS sya the same thing because mult and div have same presedence but should be evaluated left to right.

multiplaction and division should ALWAYS be evaluated left to right. so the answer is 9.
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
In fact op video the professor is wrong.

BEMDAS and BEDMAS sya the same thing because mult and div have same presedence but should be evaluated left to right.

multiplaction and division should ALWAYS be evaluated left to right. so the answer is 9.
 Quoting: Anonymous Coward 32807776


[link to www.youtube.com]


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01/22/2013 11:32 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
Isn't this the kind of stuff that one needs to learn before moving on from the 4th grade?
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01/22/2013 11:35 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
yes the answer is 9.

i'm a c programmer

6/2*(1+2) evaluates as 9, same as it will when evaluated in all other computer languages.

so 9 is the answer.
Anonymous Coward
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01/22/2013 11:36 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
yes the answer is 9.

i'm a c programmer

6/2*(1+2) evaluates as 9, same as it will when evaluated in all other computer languages.

so 9 is the answer.
 Quoting: Anonymous Coward 32807776


how any self respecting mathematician can say 1 is beyond me.
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
Isn't this the kind of stuff that one needs to learn before moving on from the 4th grade?
 Quoting: Anonymous Coward 27317240


no.
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01/22/2013 11:37 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
order of operations.....= 1!!!!!!!!!!!!!
Person445 (OP)
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01/22/2013 11:39 AM

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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
Now I'm getting floods of red karma for this posting.

If society can't even agree on a simple math equation, we are truly fucked.
petermark

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01/22/2013 11:39 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
I warped my brain with this one and came up with 9 and 9 with my TI84. Great post for getting a Phd on the horn.
H
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
order of operations.....= 1!!!!!!!!!!!!!
 Quoting: Anonymous Coward 29288454


wrong tard.

google "order of operations"

first hit:

[link to www.mathsisfun.com]

P
Parentheses first
E
Exponents (ie Powers and Square Roots, etc.)
MD
Multiplication and Division (left-to-right)
AS
Addition and Subtraction (left-to-right)

comes out as 9 tard.
Person445 (OP)
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01/22/2013 11:40 AM

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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
Childish egomaniacs that can't accept that they may be wrong.

It is not truth you seek, but the gratification of your fragile ego.
Anonymous Coward
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01/22/2013 11:41 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
Childish egomaniacs that can't accept that they may be wrong.

It is not truth you seek, but the gratification of your fragile ego.
 Quoting: Person445


computers have no ego, 99.99% of all calculations are evaluated by computers nowadays. answer is 9.
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01/22/2013 11:42 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
In fact op video the professor is wrong.

BEMDAS and BEDMAS sya the same thing because mult and div have same presedence but should be evaluated left to right.

multiplaction and division should ALWAYS be evaluated left to right. so the answer is 9.
 Quoting: Anonymous Coward 32807776


(High-five)

You are right. And you explained it perfectly
Anonymous Coward
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01/22/2013 11:43 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
Now I'm getting floods of red karma for this posting.

If society can't even agree on a simple math equation, we are truly fucked.
 Quoting: Person445


omg drama queen, 1 red karma constitutes a "flood" lol.
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01/22/2013 11:46 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
f'kin californian professors, listening to too much beatnick jazz, wearing to many elbow patches and smokin too much reefer. 1 lol!!!
petermark

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01/22/2013 11:48 AM
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Re: 6÷2(1+2)=? SOLVED by the Professor of Mathematics at California State University [video]
Now I'm getting floods of red karma for this posting.

If society can't even agree on a simple math equation, we are truly fucked.
 Quoting: Person445


Come on folks red karma?

peace
H

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