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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- Feb 1st 2010, 05:56 PMSSKIs 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? - Feb 1st 2010, 06:00 PMintegral
$\displaystyle 9 - [(2-6) + (3-17)]$=

$\displaystyle 9-[-4+(-14)]$

$\displaystyle 9--18$

$\displaystyle 9+18=27$

edit: distributive property :o - Feb 1st 2010, 06:01 PMxsavethesporksx
9-[(2-6)+(3-17)]

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

9-[-18]

distribute the negative

9+18 = 27 - Feb 1st 2010, 06:42 PMArchie Meade
If you like, you can think in terms of temperature.

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

If it was $\displaystyle 3^o$ and it fell by $\displaystyle 17^o$,

it would be $\displaystyle -14^o$

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

$\displaystyle -4$ means "subtract" 4

$\displaystyle -4+-14$ means "subtract" 4__and__"subtract" 14.

That's subtract 18 altogether.

$\displaystyle 9-[-18]$ 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. - Feb 1st 2010, 06:54 PMintegral
-- 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 (Thinking)