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How can a negative and a negative be a positive? - Answers

I presume you're asking why if you multiply two negative numbers, you end up with a positive number? Partly, it's because it's the convention in maths; but why was that convention chosen? Start with multiplying a positive and a negative: +2 x -2 = -4 To put it in practical terms; if you owe two people £2, then you owe a total of £4. So if +2 x -2 = -4 it makes sense for -2 x -2 to equal +4 - the alternative is for -2 x -2 to equal -4 and you end up with +2 x -2 = -2 x -2 which gives you +2 = -2 which is clearly wrong.



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How can a negative and a negative be a positive? - Answers

https://math.answers.com/math-and-arithmetic/How_can_a_negative_and_a_negative_be_a_positive

I presume you're asking why if you multiply two negative numbers, you end up with a positive number? Partly, it's because it's the convention in maths; but why was that convention chosen? Start with multiplying a positive and a negative: +2 x -2 = -4 To put it in practical terms; if you owe two people £2, then you owe a total of £4. So if +2 x -2 = -4 it makes sense for -2 x -2 to equal +4 - the alternative is for -2 x -2 to equal -4 and you end up with +2 x -2 = -2 x -2 which gives you +2 = -2 which is clearly wrong.



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https://math.answers.com/math-and-arithmetic/How_can_a_negative_and_a_negative_be_a_positive

How can a negative and a negative be a positive? - Answers

I presume you're asking why if you multiply two negative numbers, you end up with a positive number? Partly, it's because it's the convention in maths; but why was that convention chosen? Start with multiplying a positive and a negative: +2 x -2 = -4 To put it in practical terms; if you owe two people £2, then you owe a total of £4. So if +2 x -2 = -4 it makes sense for -2 x -2 to equal +4 - the alternative is for -2 x -2 to equal -4 and you end up with +2 x -2 = -2 x -2 which gives you +2 = -2 which is clearly wrong.

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      I presume you're asking why if you multiply two negative numbers, you end up with a positive number? Partly, it's because it's the convention in maths; but why was that convention chosen? Start with multiplying a positive and a negative: +2 x -2 = -4 To put it in practical terms; if you owe two people £2, then you owe a total of £4. So if +2 x -2 = -4 it makes sense for -2 x -2 to equal +4 - the alternative is for -2 x -2 to equal -4 and you end up with +2 x -2 = -2 x -2 which gives you +2 = -2 which is clearly wrong.

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