math: why does -3(-3) = +3? how is this solved?

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ladyj1
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math: why does -3(-3) = +3? how is this solved?

Postby ladyj1 » Wed Aug 12, 2009 6:23 pm

Hello, I have a quick question. why does -3(-3) = +3
how is this solved? thx.

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stapel_eliz
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Postby stapel_eliz » Wed Aug 12, 2009 9:38 pm

To learn how negatives work, try here. :wink:

QM deFuturo
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Re: math: why does -3(-3) = +3? how is this solved?

Postby QM deFuturo » Thu Aug 13, 2009 12:57 am

ladyj1 wrote:Hello, I have a quick question. why does -3(-3) = +3
how is this solved? thx.


Is this supposed to be a multiplication problem? I.e, are you multiplying negative 3 by itself?

If so, then your equation is not correct. If you just ignore the minus sign for the moment, what is 3 times 3? It's not 3!

When you multiply two numbers with signs (positive or negative):

First, multiply the two numbers as though there were no signs involved.
Then, determine the sign of the final product. These rules really are pretty easy.

If the signs are the same, the result is positive.
If the signs are different, the result is negative.

QM


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