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Why is a negative times a negative a positive?

Originally Posted by fly yellow It just keeps the natural progression of numbers in mathmetics. Here is the best example I can come up with: 5 x -4 = -20

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Old 06-01-2009, 11:26 PM   #3 (permalink)
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Quote:
Originally Posted by fly yellow View Post
It just keeps the natural progression of numbers in mathmetics. Here is the best example I can come up with:

5 x -4 = -20
4 x -4 = -16
3 x -4 = -12
2 x -4 = -8
1 x -4 = -4
0 x -4 = 0
-1 x -4 = 4
-2 x -4 = 8
-3 x -4 = 12
-4 x -4 = 16
-5 x -4 = 20

In that example the first factor is continuously reduced by 1. The second factor is consistently -4. The product will continue to increase by 4.

I don't know if that helps, but I really don't think there is a decent way to explain it without making yourself retarded.
Thanks for the attempt, but this was the type of conversation we had at lunch. What I want to know is why when you go - * - all of a sudden it goes +. I like your approach though by holding one number constant. I think you may have stumbled on to something on your example of crossing over at zero though. That gives me something to think about.

And BTW - how do you know I am not already retarded!! Hahaha
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