Question

why negative number multiply by negative is equal to positive number
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Answer 1

Repeated addition allows us to multiply a positive number and a negative number. ... “Negative two groups of three” makes no sense. And (−2)×(−3) is equally strange: “negative two groups of negative three.” The truth is that multiplication has no meaning here in context of repeated addition.

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Answer 2

becaz (_)×(_)=(+)

so for example=(-2)×(-2)=4