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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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What is a negative - positive?
Negative * positive = negative Positive * positive = positive Negative * negative = positive
When multiplying numbers what do you do with the positive and negative signs?
Negative * positive = negative Positive * positive = positive Negative * negative = positive
When you divided a negative number by a positive number witth the answer be positive or negative?
A negative divided by a positive is negative. A negative divided by a negative is positive. A positive divided by a positive is positive. A positive divided by a negative is negative.
What does a positive and a neagive equal?
positive and a positive is a positive negative and a negative is a positive to answer your question: positive and a negative is a negative.
What is a negative multiplied by a negative?
negative*negative=positive negative/positive=negative negative\negative=positve negative-positive=change the sign to a plus and then change the number after the sign and get your answer negative +positive=which ever numbr is bigger minus positive+positive=positive
