### Thread: Exponents and negative numbers..

1. #### Exponents and negative numbers..

So I'm pretty new and terrible at all this, but I figured seeing as I'm off to uni next year I would get better at Math...

So anyway, I'm reading these notes: http://tutorial.math.lamar.edu/Classes/Alg/Preliminaries.aspx

And I get most of it fine, except stuff like this:

(-10)^2 = 100, or (-2)^4 = 16

It confuses me. Maybe those notes weren't the best thing to start on? :S

But that's all I'm having trouble with, so far...

Any help would be great, and any books/notes that helped you when starting out would be great :3

Thank you very much.
So I'm pretty new and terrible at all this, but I figured seeing as I'm off to uni next year I would get better at Math...

So anyway, I'm reading these notes: http://tutorial.math.lamar.edu/Classes/Alg/Preliminaries.aspx

And I get most of it fine, except stuff like this:

(-10)^2 = 100, or (-2)^4 = 16

It confuses me. Maybe those notes weren't the best thing to start on? :S

But that's all I'm having trouble with, so far...

Any help would be great, and any books/notes that helped you when starting out would be great :3

Thank you very much.
I mean, 10x10 is obviously 100, so does that mean ignore the subtraction even though it gets the power? If so, why do you ignore it?
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You are kidding ...

• ishnid disagrees : That's not very encouraging.
4. Originally Posted by leszek31417
You are kidding ...

No...?
No...?
Because -10^2 is = -(10x10) isn't it? Which is -100, so I'm a little confused how it isn't a negative when the subtraction gets the power?
except stuff like this:

(-10)^2 = 100, or (-2)^4 = 16

It confuses me.
Unless I am mis-understanding what your saying, maybe this is what you need to read:
Multiplying Negatives
7. [QUOTE=kicken]Unless I am mis-understanding what your saying, maybe this is what you need to read:
[url=http://www.mathsisfun.com/mult

Yes thank you, this is what I needed.

Good thing I'm used to feeling like an idiot
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You should probably read this too:
order of operations

And I get most of it fine, except stuff like this:
(-10)^2 = 100, or (-2)^4 = 16
Because -10^2 is = -(10x10) isn't it? Which is -100, so I'm a little confused how it isn't a negative when the subtraction gets the power?
-(10*10) does equal -100 and does equal -10^2; however, (-10)^2 is not the same value - the parenthesis have actual meaning. Because terms inside parenthesis have higher operator precedence than the exponent operator, the negative sign stays with the ten and you have -10*-10, which equals 100.
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