(9.) (a+b)4. Ans. a4+4a3b+6a2b2+4ab3+ba.

(14.) (x+y+x2y2+xy3+y1) (x−y);

(15.) (a-b) (a+b) (a−b) (a+b).

(16.) (a+b) (a—b). Ans. a-a2b+ab2—b3.

Ans. 25-y5.

Ans. a4-2a2b2+ba.

(17.) (a2-2ab+b2) (a−b).

Ans. as-3a2b+3ab2-b3.

(18.) (a+2b-3c) (a-2b+3c).

Ans. a-4b2+12bc-9c2.

(19.) (25+x+x3+x2+x+1) (x−1).

Aus. 26-1.

(20.) (1+x-3x2+2x) (2+2x+x3).

Ans. 2+4+6x-2x2+x55x3+x1.

7.

3a-2b)6a2-13ab+6b2 (2a-3b

6a2-4ab

-9ab+6b2
-9ab+6b2

x3—x2b+cx) x3y—x1by+cx3y (x2y

2a2+3b) 6a3+8a2+9ab+12b (3ɑ+4

xy+2y2

10.

x—y) x3+x2y—xy2—y3 )x2+2xy+y2

11. x+2y-3z) x2-4y2+12yz-9z2 (x-2y+32

x2+2xy-3xz

-2xy-4y2+12yz
-2xy-4y+ 6yz

3.xz-6yz-9-2

12.

13.

a-1) 6-1 (a3+a++a+a2+a+1

a3-1
a3 — aa

at-1
a+—a3

14. a-b) a−b5 (a1+n3h+a22+ab3+14

a5-a4b

a3+2a+2) a7-a5+4a1-5a3-2a2+6a+2 (

16.

17.

x2 + ax +α2) x2+a2x2+a1 (x2—ax+a2
x2+a2x2+ax3

x2y2) x1y2+3x2y3 —x3y1 (x2+3y—xy2

xty2

18.

3a-4a)15a5+a+2a3-36a2(5a2+7a+10+

15a5-20a4

21a4+2a3 21a+-28a3

4a2

3a3-4a3

30a3-36a2

30a3-40a2

4a2

19.

20.

a+b) a+b3 (a1-a3b+a2b2-ab3+b+

a5+a+b