The polynomial 2x ^ 2 - 2x + 4Y - 2XY - 3Y ^ 2 is written as the difference between quadratic term and primary term

The polynomial 2x ^ 2 - 2x + 4Y - 2XY - 3Y ^ 2 is written as the difference between quadratic term and primary term

2x^2-2x+4y-2xy-3y^2
=(2x^2-2xy-3y^2)-(2x-4y)