Multiplying positive and negative numbers | Pre-Algebra | Khan Academy

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Learn some rules of thumb for multiplying positive and negative numbers.
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Pre-Algebra on Khan Academy: No way, this isn't your run of the mill arithmetic. This is Pre-algebra. You're about to play with the professionals. Think of pre-algebra as a runway. You're the airplane and algebra is your sunny vacation destination. Without the runway you're not going anywhere. Seriously, the foundation for all higher mathematics is laid with many of the concepts that we will introduce to you here: negative numbers, absolute value, factors, multiples, decimals, and fractions to name a few. So buckle up and move your seat into the upright position. We're about to take off!
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When I say "Eat!" I am encouraging you to eat (positive) But when I say "Do not eat!" I am saying the opposite (negative). Now if I say "Do NOT not eat!", I am saying I don't want you to starve, so I am back to saying "Eat!" (positive).

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why is the product of two nigetiv numbers is positive

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I miss the use of brackets between two signs, such as in -3 x -2, It should be -3(-2), shouldn't it?

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[@hiok2480]

what about multiple positive and negatives? such as: (-5) x 6 x (7) how do you know what sign to use? please help!

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Hi Ok (-)×(-) =(+) (-)÷(-)=(+) (-)×/÷(+)=(-) Hope this was helpful

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Is there a possibility of a negative five having its own square root?

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[@firas-8761]

So what do you do if you have more than 3 multiplying?

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Explain the reason why they cancel out. The explanation is necessary rather than saying "cancel out". Why?

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[@henzenc]

Stokes' theorem is easy but I don't have a clue what this is about.