Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.


Math Forum
»
Discussions
»
Education
»
mathteach
Notice: We are no longer accepting new posts, but the forums will continue to be readable.
Topic:
Re: In "square root of 1", should we say "minus 1" or "negative 1"?
Replies:
1
Last Post:
Dec 4, 2012 11:07 AM




Re: In "square root of 1", should we say "minus 1" or "negative 1"?
Posted:
Dec 4, 2012 11:07 AM


On Dec 4, 2012, at 10:40 AM, Joe Niederberger <niederberger@comcast.net> wrote:
> R. Hansen says: >   > I was thinking... > (3) * (2) = (2) + (2) + (2) = 2  2  2 > Or the other way around ... > (2) * (3) =  3  3 (repeated subtraction) (I just realized so much for crabtree's subtracted once from itself theory, that was an unexpected bonus) > And with two negatives... > (2) * (3) =  (3)  (3) (thus, when you are subtracting a minus you are actually adding) >   > > That's kind of cute  I like it. > But I think to make it solid you would have to > define multiplication of (+)x() and ()x(+) > first, and treat them asymmetrically! > > Cheers, > Joe N
I was thinking subtracting twice, not the product of signs. Like, "What is zero minus a minus 3?"
Bob Hansen



