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If two signs are the same, the result is positive and if the two signs are different the result is negative.
2 4 2
(+)(+)= +
(+)(+)=positive (-)(-)= - (+)(-)= -
If two like signs (either Positive and Positive or Negative and Negative) are multiplied, the result is positive, while unlike signs (Negative and Positive or vice versa) the result is negative.
1 5 1
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