Thread: "I Love College"

11/08/2012 10:56pm, #241

11/08/2012 10:57pm, #242
Is this algebra or is it just arithmetic?

11/08/2012 10:58pm, #2431
Parenthesis are not supposed to be the same as multiplication (e.g. 2*x and 2(x) are not technically the same, 2(x) is supposed to be a higher order operation).
But there is more to it than that...generational differences in calculators, for one. This is truly a math geek's sort of thing, so it makes me sick to my stomach and I need walk away and chew on some beef jerky.
Read away:
Date: 05/02/2008 at 13:20:22
From: Doctor Peterson
Subject: Re: Multiplying parenthetical phrases and order of operations
Hi, Rob.
Your two expressions in the calculator are
36 / 6 ( 25  11 * 2 )
and
36 / 6 * ( 25  11 * 2 )
The problem is that some calculators that allow multiplications to be implied as in the former case treat that as a higher precedence operation (as some algebra texts say), while others treat all multiplications alike (as most texts do, in my experience). You can read a little about that here:
Order of Operations
http://mathforum.org/library/drmath/view/54341.html
That has a bad link to TI's site; a current version can be found by going to their Knowledge Base and searching for "implied
multiplication". Here is a quote:
Solution 11773: Implied Multiplication Versus Explicit
Multiplication on TI Graphing Calculators.
Does implied multiplication and explicit multiplication have the
same precedence on TI graphing calculators?
Implied multiplication has a higher priority than explicit
multiplication to allow users to enter expressions, in the same
manner as they would be written. For example, the TI80, TI81,
TI82, and TI85 evaluate 1/2X as 1/(2*X), while other products
may evaluate the same expression as 1/2*X from left to right.
Without this feature, it would be necessary to group 2X in
parentheses, something that is typically not done when writing
the expression on paper.
This order of precedence was changed for the TI83 family, TI84 Plus family, TI89 family, TI92 Plus, Voyage™ 200 and the
TINspire™ Handheld in TI84 Plus Mode. Implied and explicit
multiplication are given the same priority.
If you have any further questions, feel free to write back.
 Doctor Peterson, The Math Forum
http://mathforum.org/dr.math/Last edited by W. Rabbit; 11/08/2012 11:03pm at .

11/09/2012 1:20am, #244
Damn, giving imlicit multiplication a higher priority just for the sake of (dubious) convenience is retarded. No wonder kids were screwed up in the 90s.
I first thought you were trolling. Parentheses are not operations! Yes, they state explicit order of operations, but they themselves are not operations.
****, I'm almost screaming this out loud.Last edited by Tranquil Suit; 11/09/2012 1:32am at .
go to http://www.bullshido.net/forums/prof...do=editoptions > under Thread Display Options > Number of Posts to Show Per Page: 40

11/09/2012 1:44am, #245

11/09/2012 1:54am, #246
Yes and still I'm going :Rage2:
Damn. Out of all the things on Bullshido, this is what gets me.go to http://www.bullshido.net/forums/prof...do=editoptions > under Thread Display Options > Number of Posts to Show Per Page: 40

11/09/2012 1:55am, #247

11/09/2012 2:08am, #248
I am actually kicking myself pretty hard for fucking this up. I have gone all the way through calc3. I do math on a fairly regular basis as a professional need.
I am actually rather embarrassed in fact it sort of kind of depressed me quite a bit earlier.
No matter how much I want the answer to be 1 so that I will be right there is nothing I can do about it because
the answer is
9
I also get the frustration your having, people fucking up hard factual things is scream worthy as there is no grey area.

11/09/2012 2:09am, #2491
No, the "answer" is not 9, or 1. It can be either. Read what I sourced above. There is a reason hundreds of smart people can "prove it" both ways and why different brands of calculator show it both ways.
The "answer" depends on what you're trying to use the notation to solve. And yes, adding explicit parenthesis clears it all up for the computer as Rivington pointed out.
People fucking up your and you're bugs me too, man. I feel you.
:Rage2:Last edited by W. Rabbit; 11/09/2012 2:16am at .

11/09/2012 2:22am, #250
The original problem didn't have the extra set of parenthesis, adding them changes the problem and the answer at that point is 1. There is no special way of using the notation, the notation is what it is. This didn't come from a word problem. Its a typical here are some numbers put down in an order solve them sorts of thing. When you follow the PE MD AS rules the answer comes out to 9.
Yep its a mistake I make, I understand the difference and when I am being careful I don't make it. When I am just writing a quick retort your going to get all sorts of there their, your, you're, and **** it pretty much this
http://theoatmeal.com/comics/misspelling
I should be more careful as to be taken more seriously but what eves
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