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RE: Please remind me why -3^2 = -9
Posted:
Oct 19, 2012 10:50 AM
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What if a student has to replace x by 3 in the expression - x^2? Shouldn't he or she know the result?
wayne
________________________________________
From: owner-mathedcc@mathforum.org [owner-mathedcc@mathforum.org] on behalf of Alain Schremmer [schremmer.alain@gmail.com]
Sent: Friday, October 19, 2012 7:19 AM
To: Clyde Greeno
Cc: Philip Mahler; mathedcc
Subject: Re: Please remind me why -3^2 = -9
On Oct 19, 2012, at 12:48 AM, Clyde Greeno wrote:
> In this case, the challenge to the student might be:
> "Below, insert parens to show two reasonable interpretations of
> '-3^2' ... and circle the one that is most commonly used in
> mathematical literature:
> -3^2 or -3^2 "
Very nice!!!
Best regards
--schremmer
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