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482(9+3)=???

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Old 04-07-11, 11:32 PM   #16
syzygy
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I don't understand why "order of operation" questions turn into such heated controversies over the internet. The answer is unambiguously 288.

-4^2 is unambiguously -16 for similar reasons. the "-" implies "-1" which is multiplied to "4^2." People often incorrectly read the statement as "negative four squared" when it should be read as "the negative of four squared."

Negative four squared = (-4)^2 = 16
The negative of four squared = -4^2 = -16

.999~ where the "9" is repeating is exactly equal to 1. It's not approximately 1. It's not 1 "if you round up." It's exactly and unambiguously equal to 1.

Here's a far more interesting mathematical problem to ponder -

http://en.wikipedia.org/wiki/Bertran..._(probability)
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Old 04-07-11, 11:36 PM   #17
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Quote:
Originally Posted by Davtown View Post
Wolfram Alpha agrees

this is enough to convince me that i just got an "F"
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Old 04-07-11, 11:37 PM   #18
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people getting it confused with 48+2(9+3)

that division sign is throwing people off, thinking it separates an equation like a plus sign.

glad i don't ever have to deal with this stupid syntax. I also got it wrong.

I got an 800 math SAT, but i'm no longer smarter than a 5th grader.
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Old 04-07-11, 11:43 PM   #19
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There's no shame in getting in wrong. The statement is written awkwardly and therefore forces you to carefully follow the order of operations protocol to arrive at the correct answer. At first glance, most people solve problems like this through pattern recognition instead of meticulously going through the order of operations protocol. It's perfectly understandable for people to answer "2" at first glance.

I engaged in so many of these trivial "order of operations" debates as a kid that I forced myself to meticulously apply "P E M/D A/S" before I answered.
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Old 04-07-11, 11:49 PM   #20
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Quote:
Originally Posted by syzygy View Post
I don't understand why "order of operation" questions turn into such heated controversies over the internet. The answer is unambiguously 288.

-4^2 is unambiguously -16 for similar reasons. the "-" implies "-1" which is multiplied to "4^2." People often incorrectly read the statement as "negative four squared" when it should be read as "the negative of four squared."

Negative four squared = (-4)^2 = 16
The negative of four squared = -4^2 = -16

.999~ where the "9" is repeating is exactly equal to 1. It's not approximately 1. It's not 1 "if you round up." It's exactly and unambiguously equal to 1.

Here's a far more interesting mathematical problem to ponder -

http://en.wikipedia.org/wiki/Bertran..._(probability)
don't forget to vote in the poll
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Old 04-08-11, 12:00 AM   #21
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If you look at the "input" here its different. Now its a fraction "48/2" multiplied by (9+3).

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Old 04-08-11, 12:40 AM   #22
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Originally Posted by KillaIS250 View Post
If you look at the "input" here its different. Now its a fraction "48/2" multiplied by (9+3).

[IMG]http://i.imgur.com/FDcxk.png[IMG]
Yeah, that's the same thing as 482(9+3)

If it was 48[2(9+3)], then the answer would be 2, but it's not.
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Old 04-08-11, 01:03 AM   #23
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Come on guys, I am horrible at math and got 288.
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Old 04-08-11, 01:11 AM   #24
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problem with this is that it's intentionally written like a brain teaser. People who once learned PEMDAS, and then mixed it up, are likely to get this wrong.
People who never gave a crap about math are likely to just read it from left to right.

did it ever hurt to write in some extra parentheses?

(48/2)(9+3).
There. keep it simple stupid. no thinking. no need to recall 6th grade math. no internet arguments. now, everyone should get the answer.

i'm glad that in practical everyday applications, we don't deal with 48/2(9+3).

Last edited by dunnojack; 04-08-11 at 01:14 AM.
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Old 04-08-11, 01:54 AM   #25
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PEMDAS... glad I still remember something.
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Old 04-08-11, 05:05 AM   #26
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482 (9+3)

2(9+3)=12
48/12=4

awwwwwwwww yaaaaaaaaaaaaaaaaaaaaa


No seriously, the answer is 2.

482 (9+3)

9+3 = 12
12 * 2 = 24
48 / 24 = 2

Really you guys?
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Old 04-08-11, 05:21 AM   #27
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I remember PEMDAS by the following:

Please
Excuse
My
Dear
Aunt
Sally
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Old 04-08-11, 05:29 AM   #28
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Quote:
Originally Posted by Lexmex View Post
I remember PEMDAS by the following:

Please
Excuse
My
Dear
Aunt
Sally
That's what I was taught, I'm getting 2.
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Old 04-08-11, 06:06 AM   #29
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if you dont believe us just type the equation into any graphing calculator. They are designed to perform this PEMDAS method

The answer is 2
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Old 04-08-11, 06:38 AM   #30
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my answer is 2 as well. but i can see how the answer can be 288. but is 288 really the answer?
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