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Q&A #19812

Teachers' Lounge Discussion: Explaining concept -x=2 is equal to x=-2

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From: kiran talla <kirantalla.mail@gmail.com>
To: Teacher2Teacher Public Discussion
Date: 2010012906:50:32
Subject: Re: -x=2 is equal to x=-2

Hi,

Few math steps:

-x = 2
=>-1 * x = 2
=> (-1)* -1 * x = (-1) * 2
=> 1 * x = -2   [ Rule: - * - => +  and - * + => -]

Here:
- => minus sign
+ => plus sign
* => multipication sign


Thanks,
kiran talla
http://wool.ourtoolbar.com

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