g(x,y)=ax^2+bxy+cyz^2 To find g(x,x), substitute x for y and simplify g(x,x)=ax^2+bxx+cxz^2 g(x,x)=ax^2+bx^2+cxz^2 To find g(x,y), copy it over g(x,y)=ax^2+bxy+cyz^2 To find g(y,x), substitute x for y and y for x: g(y,x)=ay^2+byx+cyz^2 Edwin