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    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.
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    Originally Posted by breadbox
    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 ...

    Comments on this post

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

    No...?
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    Originally Posted by breadbox
    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?
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    Originally Posted by breadbox
    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
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    [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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    Originally Posted by breadbox
    ...
    Good thing I'm used to feeling like ...
    Don't !!!

    It is OK to ask for explanations.

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