For all numbers a and b, let a(.)b be defined by a (.) b = ab + a + b. For all numbers x, y, and z, which of the following must be true?
#1. x(.)y = y (.) x
#2. (x-1) (.) (x+1) = (x(.)x)-1
#3. x(.) (y+z) = (x (.) y ) + (x (.) z)
***the places that i have the "(.)" symbol, its because there is a dot with a circle around it in my book, ive never seen it before!

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ah you are checking to see if it is commutative. so lets do it

I've never studies that, that i recall, but its gonna be on my SAT

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