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Author Topic: Why is - x - = +?  (Read 3924 times)

Offline BMC_Thunderbird

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Why is - x - = +?
« on: February 15, 2012, 10:33:51 PM »
I got algebra this term and I dont have a clue on it at all  :-[ so might fail already

Anyway I have to answer an argument for next week as to why a negative multiplied by a negative is a positive.

Can anyone help please?

It has to be because of a law or something and not just because teacher said so.
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Offline BMC_Balatr0

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Re: Why is - x - = +?
« Reply #1 on: February 16, 2012, 11:35:29 PM »
Hmmm, I don't know. -(-a)=a is one of the basic rules of algebra right ? I don't think this is something you have to prove ... at least I my algebra class, we didnt have to.
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Offline BMC_Thunderbird

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Re: Why is - x - = +?
« Reply #2 on: February 17, 2012, 12:03:53 AM »
Yup  :( But offered 5% for anyone who said they can show why and finding it hard to do  :'(.
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Offline BMC_Zeuske

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Re: Why is - x - = +?
« Reply #3 on: February 17, 2012, 08:56:56 AM »
Sorry But I'm not smart enough for that :)
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Offline BMC_Thunderbird

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Re: Why is - x - = +?
« Reply #4 on: February 17, 2012, 11:44:27 AM »
Its ok, my maths level is nursery school standard with my dyslexia
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