A binary operation* is defined on the set R of real number by x*y=x+y-2xy, where x, y belong to set R. Determine whether or not the operation* is commutative. Pls help

Iam not sure but i think the answer is b

Thats where they was ported and the fields that noone really knew much about needed tended, so they put slaves out there do free work and huge profits and so on the north decided to hold its own and was more different way of survival did not have same climate conditions to afford protecting slaves from winter so expenses be diff from south

Iam confused on this my self