d) (x + y)(x – y) + (xy^4 – x^3y^2) : (xy^2).
d) (x + y)(x – y) + (xy4 – x3y2) : (xy2).
d) (x + y)(x – y) + (xy4 – x3y2) : (xy2).
d) (x + y)(x – y) + (xy4 – x3y2) : (xy2)
= x . x + x . y – x . y – y . y + (xy4) : (xy2) – (x3y2) : (xy2)
= x2 – y2 + y2 – x2 = (x2 – x2) + (y2 – y2) = 0.