Just because.
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+1. This man knows his ****.

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The second negative cancels out the first. "I don't not want to do something" = "I want to do something"
I wouldn't question it. Doing so would cause the bomb they planted in your bladder to explode.
If we can agree that a negative number is just a positive number multiplied by -1, then we can always write the product of two negative numbers this way:

(-a)(-b) = (-1)(a)(-1)(b) = (-1)(-1)ab

For example,

-2 * -3 = (-1)(2)(-1)(3)

= (-1)(-1)(2)(3)

= (-1)(-1) * 6

So the real question is,

(-1)(-1) = ?

(-1)(-1) = +1

This convention has been adopted for the simple reason that any other convention would cause something to break.

For example, if we adopted the convention that (-1)(-1) = -1, the distributive property of multiplication wouldn't work for negative numbers:

(-1)(1 + -1) = (-1)(1) + (-1)(-1)

(-1)(0) = -1 + -1

0 = -2

Since everything except +1 can be excluded as impossible, it follows that, however improbable it seems, (-1)(-1) = +1.

Yay for elementary.
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First Google result for "multiplying negatives".

Though the websites' name is questionable.
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darthteet just scored big on the win scale.
They cancel each other out. When you multiply two negatives, you're effectively canceling out a negative, and since the number can't be 0 it must be a positive number.

This is one of those things where you're better off just believing that this is just how it is and not questioning it, because it's hard to thoroughly understand and even harder to explain.
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Quote by Sammythedruggie

touche sir.
a negative number times a positive number equals a negative number cuz of (3)(-3)
-3
-3
-3
-9

a negative has a more complicated reason, if you multiply the reciprocal(?) it gives you a positive number, example=

-3
1

is the same as

1
3

Which also is the same as

-1
-3

so, if the negative is converted into the positive with the reciprocal (sp?) your really just multiplying it by 2 postives
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Check out my
Tumblr
BECAUSE IT IS DAMMIT!

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My God, this must be the smartest/greatest guy ever.
grow a brain and think about it

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Because you have negative negatives. And what is the negative of a negative? positive.
Its basicly a root off of finding the absolute value.
Because math is garbage.
You're*
Aww, I wanted to answer this one.

think of it as a math-line.
negatives - 0 - positives
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Seth: 1
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Aww, I wanted to answer this one.

think of it as a math-line.
negatives - 0 - positives

Damnit seth everytime you make a post i see your avatar and get sad about my pokemon red being lostedid .

I was going to post the gridline but i gots lazy.
Because mathematicians decided they'd make up random formulas for numbers to torture humanity for the rest of its existence.
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