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Math Help - Is this factoring or something?

  1. #1
    SSK
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    Is this factoring or something?

    I honestly don't know what this is but I think it relates to factoring

    I have a problem

    9 - [(2-6) + (3-17)]

    The answer is 27

    But how?
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  2. #2
    Member integral's Avatar
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    9 - [(2-6) + (3-17)]=
    9-[-4+(-14)]
    9--18
    9+18=27

    edit: distributive property
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  3. #3
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    9-[(2-6)+(3-17)]

    9-[(-4)+(-14)]

    9-[-18]

    distribute the negative

    9+18 = 27
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  4. #4
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    Quote Originally Posted by SSK View Post
    I honestly don't know what this is but I think it relates to factoring

    I have a problem

    9 - [(2-6) + (3-17)]

    The answer is 27

    But how?
    If you like, you can think in terms of temperature.

    If it was 2^o and the temperature dropped by 6^o then it will have fallen to -4^o

    If it was 3^o and it fell by 17^o,
    it would be -14^o

    9-[(2-6)+(3-17)]=9-[-4+-14]

    -4 means "subtract" 4
    -4+-14 means "subtract" 4 and "subtract" 14.
    That's subtract 18 altogether.

    9-[-18] means "do the opposite" of subtract 18 from 9,
    and since subtraction is the opposite of addition,
    addition is the opposite of subtraction, then 9--18 is 9+18.

    To get the hang of things, you can think that way.
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  5. #5
    Member integral's Avatar
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    -- is + because

    If you take a positive # c

    c

    and you subtract a negitive number d

    c-(-d)=r


    You are taking away a bit less than nothing.
    And if you are taking away less than nothing r must be moving further from nothing.

    Like owning money.

    I owe 5$ and someone subtracts 4 dollars from my debt, now I owe 1$
    I.E.
    -5--4=-1

    idk if that helps just trying to put usefull info out there
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