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March 12th, 2011, 01:45 PM   #1
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Exponent Question

Greetings,

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

Thanks,

DR
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March 12th, 2011, 01:48 PM   #2
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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.
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March 12th, 2011, 01:58 PM   #3
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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
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March 12th, 2011, 02:35 PM   #4
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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.
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March 12th, 2011, 02:56 PM   #5
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Re: Exponent Question

OK gotcha,

So then to be clear:

-4^2 = -(4*4) and NOT (-4 * -4)?
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March 12th, 2011, 05:23 PM   #6
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Correct.
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