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In This video I explain the Rules of Signs: plus times plus is plus, plus times minus is minus,
minus times plus is plus, minus times minus is plus. In other words, if the factors have the same sign
we get a plus, if they have different signs we get a minus. If you have more than two factors, if the
number of minus signs is odd, you get a minus, if it is even, you get a plus.
Prof. Serna. Math, Statistics & Physics Tutor. Miami.
10300 SW 72nd Street, Suite 460-5, Miami, FL 33173.