+ x + =+
- x - = -
+ x - = -
- x + = -
When the signs are the same then it's positive when they are different then it's negative
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positive times negative equals negative. positive times positive equals positive. negative times negative equals positive
A negative times a negative equals a positive A negative times a positive equals a negative A positive times a positive equals a positive
A positive times a positive equals a positive, a negative times a negative equals a positive, a negative times a positive equals a negative(vice versa for the last one)
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because the opposite of a negative is a positive