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Re: Checking simplified algebraic expressions (the -3 test)

by Bill Dubuque <wgd@[EMAIL PROTECTED] > May 15, 2008 at 01:17 AM

Pubkeybreaker <pubkeybreaker@[EMAIL PROTECTED]
> wrote:
>On May 3, 8:57 pm, "michalc...@[EMAIL PROTECTED]
" <michalc...@[EMAIL PROTECTED]
> wrote:
>>
>> I tutor a lot of algebra and as you know there are three basic types
>> of problems that algebra students are given. [...]
>>
>> Example "Simplify (x^2-1)/(x+1)" this becomes "x-1".
> 
> Which, of course, is just wrong.  If  x=-1,  then the quotient is
> undefined, > but the simplification equals -2.  The correct answer 
> must state this exception.

No, (x^2-1)/(x+1) = x-1  is correct if the expressions denote
polynomials, which is quite frequently the case in "algebra".

--Bill Dubuque




 31 Posts in Topic:
Checking simplified algebraic expressions (the -3 test)
 "michalchik@[EMAIL P  2008-05-03 17:57:33 
Re: Checking simplified algebraic expressions (the -3 test)
 Mensanator <mensanator  2008-05-03 18:32:10 
Re: Checking simplified algebraic expressions (the -3 test)
 "michalchik@[EMAIL P  2008-05-03 23:23:45 
Re: Checking simplified algebraic expressions (the -3 test)
 Arturo Magidin <magidi  2008-05-03 23:42:37 
Re: Checking simplified algebraic expressions (the -3 test)
 Rupert Swarbrick <rswa  2008-05-04 12:32:57 
Re: Checking simplified algebraic expressions (the -3 test)
 "michalchik@[EMAIL P  2008-05-04 00:23:14 
Re: Checking simplified algebraic expressions (the -3 test)
 Rupert Swarbrick <rswa  2008-05-04 12:37:58 
Re: Checking simplified algebraic expressions (the -3 test)
 magidin@[EMAIL PROTECTED]  2008-05-04 18:14:51 
Re: Checking simplified algebraic expressions (the -3 test)
 Mensanator <mensanator  2008-05-04 07:57:54 
Re: Checking simplified algebraic expressions (the -3 test)
 Bob LeChevalier <lojba  2008-05-04 13:58:49 
Re: Checking simplified algebraic expressions (the -3 test)
 "michalchik@[EMAIL P  2008-05-04 21:24:06 
Re: Checking simplified algebraic expressions (the -3 test)
 magidin@[EMAIL PROTECTED]  2008-05-05 14:29:23 
Re: Checking simplified algebraic expressions (the -3 test)
 "michalchik@[EMAIL P  2008-05-04 21:34:13 
Re: Checking simplified algebraic expressions (the -3 test)
 Pubkeybreaker <pubkeyb  2008-05-05 04:53:02 
Re: Checking simplified algebraic expressions (the -3 test)
 Bill Dubuque <wgd@[EMA  2008-05-15 01:17:21 
Re: Checking simplified algebraic expressions (the -3 test)
 "Dave L. Renfro"  2008-05-05 08:56:34 
Re: Checking simplified algebraic expressions (the -3 test)
 Mensanator <mensanator  2008-05-05 10:20:02 
Re: Checking simplified algebraic expressions (the -3 test)
 fflittle@[EMAIL PROTECTED  2008-05-05 10:42:52 
Re: Checking simplified algebraic expressions (the -3 test)
 Mensanator <mensanator  2008-05-05 11:06:40 
Re: Checking simplified algebraic expressions (the -3 test)
 "michalchik@[EMAIL P  2008-05-06 03:33:17 
Re: Checking simplified algebraic expressions (the -3 test)
 magidin@[EMAIL PROTECTED]  2008-05-06 13:49:41 
Re: Checking simplified algebraic expressions (the -3 test)
 Rupert Swarbrick <rswa  2008-05-06 16:30:09 
Re: Checking simplified algebraic expressions (the -3 test)
 "michalchik@[EMAIL P  2008-05-06 03:47:56 
Re: Checking simplified algebraic expressions (the -3 test)
 "michalchik@[EMAIL P  2008-05-09 04:03:22 
Re: Checking simplified algebraic expressions (the -3 test)
 Pubkeybreaker <pubkeyb  2008-05-15 05:39:05 
Re: Checking simplified algebraic expressions (the -3 test)
 Fatal <fatal@[EMAIL PR  2008-05-15 15:09:25 
Re: Checking simplified algebraic expressions (the -3 test)
 Bill Dubuque <wgd@[EMA  2008-05-15 13:44:58 
Re: Checking simplified algebraic expressions (the -3 test)
 Pubkeybreaker <pubkeyb  2008-05-15 10:46:16 
Re: Checking simplified algebraic expressions (the -3 test)
 Bill Dubuque <wgd@[EMA  2008-05-15 14:49:32 
Re: Checking simplified algebraic expressions (the -3 test)
 lwalke3@[EMAIL PROTECTED]  2008-05-15 13:58:05 
Re: Checking simplified algebraic expressions (the -3 test)
 Pubkeybreaker <pubkeyb  2008-05-16 05:23:22 

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