Let f left parenthesis x comma y right parenthesis equals x squared minus 2 xy minus y squaredf(x,y)=x2−2xy−y2. Compute f left parenthesis 2 comma 0 right parenthesisf(2,0) and f left parenthesis 2 comma negative 3 right parenthesisf(2,−3). f left parenthesis 2 comma 0 right parenthesisf(2,0)equals=nothing​(Simplify your​ answer.) f left parenthesis 2 comma negative 3 right parenthesisf(2,−3)equals=nothing ​(Simplify your​answer.)