I can't make sense of this. Are X and x, and Y and y, supposed to be the same? Does "*" mean multiplication as it usually does, or are you perhaps defining it as a new operation, x*y = x2 - 3xy - y2 ?
If so, then you can determine what (1)*(-1) is by replacing each variable with its value and evaluating the expression. (You don't get 5.)
But what in the world does "I,z=0.x*y *z" mean? Please explain the question in words, and quote the entire problem as given to you, exactly.
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