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Math Help - Simplify a Negative

  1. #1
    Junior Member Jarod_C's Avatar
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    Simplify a Negative

    Ok, it says -(-10) is 10, which I get, but why does -|-5.2| = -5.2? I thought || were the same as ()
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  2. #2
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    Quote Originally Posted by Jarod_C View Post
    Ok, it says -(-10) is 10, which I get, but why does -|-5.2| = -5.2? I thought || were the same as ()
    The |x| is the modulus of x and it is always positive so...

    -|-5.2| = - |5.2| = -5.2

    Whereas (x) are just brackets and do not change the value of x inside so...

    -(-10) = - - 10 = 10 (It's a minus of a negative number so makes it positive).
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  3. #3
    Junior Member Jarod_C's Avatar
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    thanks for the fast reply, how about [x]? I guess I should ask now instead of when it comes up in the future.

    Edit: I think I know the answer, [x] is the same as |x| Right?
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    Quote Originally Posted by Jarod_C View Post
    thanks for the fast reply, how about [x]? I guess I should ask now instead of when it comes up in the future.
    You don't get square brackets unless you want to show a bracket of a bracket in which case a square bracket looks neater so...

    e.g. [ (x + 2) (x - 2)] - 2
    (In which case you are saying, find the value of the brackets first then do the arithmetic outside the square bracket).

    A square bracket doesn't change the value of the number so it is the same as (x) curvy bracket.

    EDIT: It is not the same as modulus = |x|
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  5. #5
    Junior Member Jarod_C's Avatar
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    I've got a test tomarrow, and the quickness of your replys are helping a lot.
    Thanks for the quick help, thanks to air for supporting the site, and thanks to the owners of the site.
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