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iamthepush
iamthepush
Joined: May 26, 2010
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April 15th, 2011 at 4:30:51 AM permalink
Apperently there is some confusion as to the answer of this question. What say you WOV memebers?


JIMMYFOCKER
JIMMYFOCKER
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April 15th, 2011 at 4:40:23 AM permalink
288 is my answer
weaselman
weaselman
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April 15th, 2011 at 4:45:30 AM permalink
Operations of the same priority are performed left-to-right. The answer is 288.
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DJTeddyBear
DJTeddyBear
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April 15th, 2011 at 5:08:01 AM permalink
288.

But what's most interesting is that different models from the same brand calculator have conflicting answers. I would have expected, if anything, that the brands would differ, but all models from one brand would have the same result.

Very interesting.....
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weaselman
weaselman
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April 15th, 2011 at 6:26:40 AM permalink
Quote: DJTeddyBear

288.

But what's most interesting is that different models from the same brand calculator have conflicting answers. I would have expected, if anything, that the brands would differ, but all models from one brand would have the same result.

Very interesting.....


TI-85 had a bug, that got fixed in next version - TI-86
"When two people always agree one of them is unnecessary"
Paigowdan
Paigowdan
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April 15th, 2011 at 6:44:41 AM permalink
See: the order of precidence.
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Planet math:
http://planetmath.org/?op=getobj&from=objects&id=3951

Wiki (Hi, Bob!)
http://en.wikipedia.org/wiki/Order_of_operations
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pacomartin
pacomartin
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April 15th, 2011 at 6:45:35 AM permalink
Quote: weaselman

TI-85 had a bug, that got fixed in next version - TI-86



Wikipedia entry:
An expression like 1/2x is interpreted as 1/(2x) by TI-82, but as (1/2)x by TI-83. While the first interpretation may be expected by some users, only the latter is in agreement with the standard rules

The TI-82 is a graphing calculator made by Texas Instruments. The TI-82 was designed in 1993 as a stripped down, more user friendly version of the TI-85.


Did you ever notice that Excel interprets -3^2 as +9 and not -9?
weaselman
weaselman
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April 15th, 2011 at 8:49:06 AM permalink
Quote: pacomartin


Did you ever notice that Excel interprets -3^2 as +9 and not -9?


That is correct. Unary operators have the highest precedence.
"When two people always agree one of them is unnecessary"
Wizard
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Wizard
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April 15th, 2011 at 8:49:49 AM permalink
I go with 288 also.

An argument could be made, I say incorrectly, for doing the multiplication before the division, per the Please Excuse My Dear Aunt Sally rule. This is a memory device for the order of operations. It would suggest doing parenthesis first, then exponents, then multiplication, then division, then subtraction, and addition last.

Where this is not quite right is multiplication and division are equal in priority, as well as addition with subtraction. When both are present, you go left to right. So somebody who took the PEMDAS method literally would do 48 / 2(9+3) = 48/2*12 = 48/24 = 2.

I agree up to the 48/2*12. Since multiplication and division are equal, you do the left operand first, or 48/2*12 = 24*12 = 288.
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dm
dm
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April 15th, 2011 at 9:05:28 AM permalink
I go with 2. If 288 is wanted then write it (48/2)(9+3)

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