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Brij owns a rectangular farmland X having length $3 a^2+a^2 b-2 a b$ and perimeter $6 a^2+2 a^2 b-2 a b-4 b^2$. Today he purchased the adjacent farmland $Y$ and combined the two farmlands into one. The length of his farmland now increased by $a^2+a b$, while the breadth remained the same.

Q.1. Find the breadth of farmland X.
(a) $6 a^2+a b-2 b^2$$\quad$(b) $a b-2 b^2$$\quad$(c) $12 a^2-4 a b$$\quad$(d) $-4 b^2$
Q.2. Find the length of the combined farmland.
(a) $4 a^2-a b+a^2 b$$\quad$(b) $a^2+2 a b-2 b^2$$\quad$(c) $2 a^2-3 a b+a^2 b$$\quad$(d) $4 a^2-3 a b+a^2 b$
Q.3. The perimeter of the combined farmland is
(a) $8 a^2+2 a^2 b+4 a b+4 b^2$$\quad$(b) $4 a^2+4 a b-2 a^2 b-8 b^2$
(c) $4 a^2-2 a^2 b+4 b^2$$\quad$(d) $8 a^2+2 a^2 b-4 b^2$
Q.4. The area of the farmland Y is
(a) $a^3 b+a^2 b^2+a b^3$$\quad$(b) $a^3 b-2 a^2 b^2-a b^3$$\quad$(c) $a^3 b-2 a^2 b^2+a b^3$$\quad$(d) $a^3 b-a^2 b^2-2 a b^3$