**Subtract :**

**(i) 4xy ^{2} from 3xy^{2 };**

**(ii) -2x ^{2}y + 3xy^{2} from 8x^{2}y ;**

**(iii) 3a – 5b + c + 2d from 7a – 3b + c – 2d**

**(iv) x ^{3} – 4x – 1 from 3x^{3} – x^{2 }+ 6**

**(v) 6a + 3 from a ^{3} – 3a^{2 }+ 4a + 1**

**(vi) Cab – 4cad – cbd from 3abc + 5bcd – cda**

**(vii) a ^{2} + ab + b^{2} from 4a^{2} – 3ab + 2b^{2}**