Why multiplying negatives gives you a positive:http://www.khanacademy.org/math/arithmetic/negative-numbers/v/why-a-negative-times-a-negative-is-a-positive …
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Why multiplying negatives gives you a positive:http://www.khanacademy.org/math/arithmetic/negative-numbers/v/why-a-negative-times-a-negative-is-a-positive …
