Why is a negative number times a negative number positive❓❓

Описание к видео Why is a negative number times a negative number positive❓❓

In this video we show, step by step, that when multiplying a negative number by a negative number the result is always a positive number.

David's science and music channel:    / drdaviddarling  
Juan's mathematics channel (Spanish):    / juanmemol  

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