Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Education » mathedcc

Topic: Please remind me why -3^2 = -9
Replies: 26   Last Post: Nov 18, 2012 7:51 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Matthews, George

Posts: 8
Registered: 4/2/07
RE: Please remind me why -3^2 = -9
Posted: Nov 18, 2012 10:57 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

Not mentioned in previous responses to the question is the rationale for the conventional order of operations:
Exponents (powers) before Products (or divisions) before Sums (or subtractions), in the absence of parentheses (grouping symbols),
is convenience in writing polynomials.
ax^p+bx^q+..., where x is a free variable, is much easier to read than
(a(x^p))+(b(x^q))+...

Those familiar with APL notation or Excel formulas are surely aware of these issues.

That said, this forum should be open to any mathematical, pedagogical question without judgment about motives or intelligence.

Just my two cents.
________________________________________
From: owner-mathedcc@mathforum.org [owner-mathedcc@mathforum.org] on behalf of EddieC [info@kopworld.net]
Sent: Sunday, November 18, 2012 6:28 AM
To: mathedcc@mathforum.org
Subject: Re: Please remind me why -3^2 = -9

You're a teacher & you had to post this question?
****************************************************************************
* To post to the list: email mathedcc@mathforum.org *
* To unsubscribe, email the message "unsubscribe mathedcc" to majordomo@mathforum.org *
* Archives at http://mathforum.org/kb/forum.jspa?forumID=184 *
****************************************************************************
****************************************************************************
* To post to the list: email mathedcc@mathforum.org *
* To unsubscribe, email the message "unsubscribe mathedcc" to majordomo@mathforum.org *
* Archives at http://mathforum.org/kb/forum.jspa?forumID=184 *
****************************************************************************


Date Subject Author
10/18/12
Read Please remind me why -3^2 = -9
Phil Mahler
10/18/12
Read Re: Please remind me why -3^2 = -9
John Peterson
10/18/12
Read Re: Please remind me why -3^2 = -9
Guy Brandenburg
10/18/12
Read RE: Please remind me why -3^2 = -9
Wayne Mackey
10/18/12
Read RE: Please remind me why -3^2 = -9
Phil Mahler
10/18/12
Read RE: Please remind me why -3^2 = -9
RotmanJ
10/18/12
Read Re: Please remind me why -3^2 = -9
Paul Hertzel
10/18/12
Read Re: Please remind me why -3^2 = -9
Phil Mahler
10/18/12
Read Re: Please remind me why -3^2 = -9
Clyde Greeno
10/19/12
Read Re: Please remind me why -3^2 = -9
Clyde Greeno
10/19/12
Read Re: Please remind me why -3^2 = -9
Alain Schremmer
10/19/12
Read RE: Please remind me why -3^2 = -9
Wayne Mackey
10/19/12
Read Re: Please remind me why -3^2 = -9
Alain Schremmer
10/19/12
Read Re: Please remind me why -3^2 = -9
Clyde Greeno
10/19/12
Read Re: Please remind me why -3^2 = -9
Alain Schremmer
10/21/12
Read RE: Please remind me why -3^2 = -9
Wayne Mackey
11/14/12
Read Re: Please remind me why -3^2 = -9
Beth Hentges
11/15/12
Read Re: Please remind me why -3^2 = -9
Clyde Greeno
11/16/12
Read Re: Please remind me why -3^2 = -9
Alain Schremmer
10/18/12
Read RE: Please remind me why -3^2 = -9
Collinge, Peter (Mathematics)
10/18/12
Read Re: Please remind me why -3^2 = -9
Guy Brandenburg
10/18/12
Read Re: Please remind me why -3^2 = -9
Phil Mahler
10/18/12
Read Re: Please remind me why -3^2 = -9
Alain Schremmer
11/18/12
Read Re: Please remind me why -3^2 = -9
EddieC
11/18/12
Read RE: Please remind me why -3^2 = -9
Matthews, George
11/18/12
Read Re: Please remind me why -3^2 = -9
Phil Mahler
11/18/12
Read Re: Please remind me why -3^2 = -9
Alain Schremmer

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.