I figured this out one day..................they will probably told u I looked it up.......but ask some Marines about it.........I knew twenty years ago why this is so...............................I will use money as an analogy..........

We can represent "removes" by a negative number and figure out the answer by multiplying. This is an illustration of a negative times a negative resulting in a positive. If one thinks of multiplication as grouping, then we have made a positive group by taking away a negative number twelve times.

Math Forum: Ask Dr. Math FAQ: Negative Times a Negative

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Why a negative times a negative is a positive (video) | Khan Academy

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https://www.khanacademy.org/...negative...negatives/.../why-a-nega...

When you multiply a negative by a negative you get a positive, because the two negative signs are ...

Math Forum: Ask Dr. Math FAQ: Negative Times a Negative

mathforum.org/dr.math/faq/faq.negxneg.html

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We can represent "removes" by a negative number and figure out the answer by multiplying. This is an illustration of a negative times a negative resulting in a positive. If one thinks of multiplication as grouping, then we have made a positive group by taking away a negative number twelve times.

Multiplying Negatives Makes A Positive - Math is Fun

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Why does multiplying two negative numbers make a positive? ... He takes 2 paces at a time, and does this three times, so he moves 2 steps x 3 = 6 steps forward ...