Discussion:  All Topics 
Topic:  Expressions vs Equations 
Related Item:  http://mathforum.org/mathtools/tool/99226/ 
Post a new topic to the tool: Algebra  Writing Expressions discussion 

Subject:  RE: Expressions vs Equations 
Author:  Hemiboso 
Date:  Jan 26 2011 
obviously a nonmathematician). I'm still mulling over your response, but I
think I get it :).
On Jan 26 2011, The Math Guy wrote:
> No, I would not consider any of those as equations. Even in the
> case where you were evaluating (replacing x, y, & z with numbers)
> the expression, you don't have an equation. If you looked at 3x+5 =
> 7...that is an equation. But for 3x+5, if x = 2, then your are
> evaluating the expression 3x+5 when x = 2 and your evaluation might
> go something like this:
3x + 5:
3(2) + 5 =
6 + 5 =
11
The "="
> sign is used to separate the different forms of the expression...
> But the = sign is not what is making this evaluation process into an
> equation.
On the other hand,if you did write
3(2) + 5 = 11, then
> that equation is an Identity...true for all times just as
cos^2 X +
> sin^2 X = 1 for all values of X...an identity.
Art M.
==================================================
Posted: Jan 26 2011
By:
Subject: RE: Expressions vs Equations
Would you consider x^n * y^n ± z^n (where x=2, y=3 and z=5) an equation, formula
or expression?
Note the absence of an equal sign.
However, when you populate the "formula" (if that's what it is) it decidedly
becomes an equality viz. equation, e.g., 2^3 * 3^2  5 = 67
(all integers in the set of natural numbers not divisible by 2, 3 and 5 can be
generated with this "formula") (ref: www.primesdemystified.com )
 DO NOT REPLY TO THIS MESSAGE 
If you wish to respond to this message or participate
in the discussion, please go to the Math Tools web site
http://mathforum.org/mathtools/discuss.html?do=r&msg=113537
 
Post a new topic to the tool: Algebra  Writing Expressions discussion  
Visit related
discussions: Algebra  Writing Expressions tool  