d) (x2y – 3xy2 – y2) + (5xy2 – 4y2 + 5x2y).
d) (x2y – 3xy2 – y2) + (5xy2 – 4y2 + 5x2y).
d) (x2y – 3xy2 – y2) + (5xy2 – 4y2 + 5x2y)
= x2y – 3xy2 – y2 + 5xy2 – 4y2 + 5x2y
= (x2y + 5x2y) + (– 3xy2 + 5xy2) +(– y2 – 4y2)
= 6x2y + 2xy2 – 5y2.