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duncanrager March 12th, 2011 01:45 PM

Exponent Question
 
Greetings,

Is -x^2 equal to -(x^2) or (-x^2)?

Thanks,

DR

DLowry March 12th, 2011 01:48 PM

Re: Exponent Question
 
Both. By sticking parenthesis around it, you haven't changed anything. I will assume you were asking about (-x)^2 --> but it's not equal to that.

duncanrager March 12th, 2011 01:58 PM

Re: Exponent Question
 
Maybe I was unclear...

Let's take for example:

-4^2

That cannot be equal to both -(4^2) and (-4^2), because the first yields -16 while the second yields 16.

Thanks,

DR

mathman March 12th, 2011 02:35 PM

Re: Exponent Question
 
Quote:

Originally Posted by duncanrager
Maybe I was unclear...

Let's take for example:

-4^2

That cannot be equal to both -(4^2) and (-4^2), because the first yields -16 while the second yields 16.

Thanks,

DR

You seem to misunderstand parentheses. The only way to get 16 and not -16 is to parentheses before squaring, that is (-4)^2. -4^2=-16, putting ( ) around it afterward doesn't change anything.

duncanrager March 12th, 2011 02:56 PM

Re: Exponent Question
 
OK gotcha,

So then to be clear:

-4^2 = -(4*4) and NOT (-4 * -4)?

johnny March 12th, 2011 05:23 PM

Correct.


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