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-   -   Do this math problem... (http://www.peachparts.com/shopforum/showthread.php?t=197947)

Ara T. 08-24-2007 02:57 AM

I think the calculator "sees" -3^2 like (-1)(3)(3)

MS Fowler 08-24-2007 05:48 AM

I disagree that you can get multiple correct answers. There are rules that all arithmetic follows. Lacking parentheses, operations follow a default, order of operations. Follow the rules and will get THE correct answer, regardless of what google, or any other " authority" says.
One of the problems with "stretch" education is that it removes the discipline requuired to get correct answers.

Medmech 08-24-2007 08:06 AM

You did it too!:D

Kuan 08-24-2007 08:50 AM

-3^2(4)+7(2)/14(3)^2+(3-7)^2/8(2)-(-8)^2

I got

-36+9+1-64

Second group is the most ambigious as Brian noted.

A264172 08-24-2007 09:26 AM

Quote:

Originally Posted by Matt L (Post 1600719)
-3^2 is indeed -9. ...

Is it also 9?

A264172 08-24-2007 09:45 AM

Quote:

Originally Posted by TheDon (Post 1600773)
seriously.. wtf


I don't like this.. I did calculus .. no problem.. got an A.. but this crap they put me in by default( my score.... 1 point to low to be put into college algebra is pissing me off)...


I put all my problems into google and I got all of them wrong according to mutha funkn google...

This would be a good time to develop the habbit of meeting with your prof or a school study assistance dept to get the the ideas worked out early on... I guess that's what you are doing here but I think you might find the former two options more informitive.
Smart people like yourself are usually resistant to seeking help in their studies. but instruction is not always clear, and you'll get further faster and easier if you take as much clarification as you can.
I wish I was better at arithmetic... you're a lot closer to understanding this problem than I am... and the phrasing may be vague (as Brian said)

http://mathforum.org/library/drmath/view/55713.html

The eariler you start to seek out help when you are having a hitch, the better off you'll be but a lot of students won't do it because they want to learn on their own. Kind of silly when the reason for being in school is to learn as much as you can from 'teachers'

Good luck ... I know you'll be dancing on these problems graves in no time.

A264172 08-24-2007 09:48 AM

Quote:

Originally Posted by Howitzer (Post 1600955)
You did it too!:D

I had to. I thought "^" ment "the guy above my post"

WINGAS 08-24-2007 10:02 AM

Yeah, I dont know what ^ means, but I do financial math, probabilities, regressions. Aitn never seen a ^. Use RPN everyday with my trusty HP 12c. Define ^ and I'll cruch that algebra in a second.

But, as is said ( and I do teach college finance on occassion) IF your professor actually speaks English well, I'd ask him/her AFTER I made an attempt.

Medmech 08-24-2007 10:05 AM

Quote:

Originally Posted by WINGAS (Post 1601046)
Yeah, I dont know what ^ means, but I do financial math, probabilities, regressions. Aitn never seen a ^. Use RPN everyday with my trusty HP 12c. Define ^ and I'll cruch that algebra in a second.

I keep a 12c in the car but I use my trusty 19BII at the office, its had a rough life so electrical tape keeps it together I'll post a pic of it.

WINGAS 08-24-2007 10:14 AM

Howie, you a finance guy too?

Medmech 08-24-2007 10:25 AM

Quote:

Originally Posted by WINGAS (Post 1601057)
Howie, you a finance guy too?

I try to be. :D

Matt L 08-24-2007 10:28 AM

Quote:

Originally Posted by MS Fowler (Post 1600910)
I disagree that you can get multiple correct answers. There are rules that all arithmetic follows. Lacking parentheses, operations follow a default, order of operations. Follow the rules and will get THE correct answer, regardless of what google, or any other " authority" says.
One of the problems with "stretch" education is that it removes the discipline requuired to get correct answers.

This is correct. -3^2 is parsed as -(3^2). Always.

A264172 08-24-2007 10:29 AM

Quote:

Originally Posted by WINGAS (Post 1601046)
Yeah, I dont know what ^ means, but I do financial math, probabilities, regressions. Aitn never seen a ^. Use RPN everyday with my trusty HP 12c. Define ^ and I'll cruch that algebra in a second...

I think, after a days consideration, that x^2 = x squared.

Matt L 08-24-2007 10:31 AM

Quote:

Originally Posted by TheDon (Post 1600771)
how can -3 be -9... a negative times a negative is always positive

Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Please Excuse My Dear Aunt Sally

-3^2. Follow your "formula." "Exponents" comes before "subtraction."

I don't know why you bother to put "multiplication" before "division" and "addition" before "subtraction," but I suppose that this is modern eduction in action.

Hatterasguy 08-24-2007 11:42 AM

I don't do math, period.


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