(10.) (a2+a+1) (a−1).

(11.) (2x-3y) (3x—2y).

(9.) (a+b)1. Ans. a+4a3b+6a2b2+4ab3+b1.

Ans. a3-1.

Ans. 6x2-13xy+6y2.

(12.) (2a+b) (a+2b).

Ans. 2a2+5ab+26o.

(13.) (a2+b2) (a+b).

Ans. as+ab+ab2+b3.

(14.) (x1+x3y+x2y2+xy3+y1) (x−y).

Ans. 25-y5.

(15.) (a−b) (a+b) (a−b) (a+b).

Ans. a4-2a2b2+b1.

(16.) (a2+b2) (a—b). Ans. a3-a2b+ab2-b3.

(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).

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

Aus. 26-1.

Ans. 2+4+6x-2x2+x5-5x+x7.

7.

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

6a2-4ab

-9ab6b2
-9ab+6b2

x3 —x2b+cx) x3y—x1by+cx3y (x2y

2a+3b) 6a3+8a2+9ab+12b (3m+4

6a3

+9ab

xy+2y2

10.

x—y) x3+x2y—xy2—y3 )x2+2xy+y2

11. x+2y-3z) x2-4y2+12yz—9z2 (x−2y+3z

x2+2xy-3xz

13.

a-1) a6-1 (a5+a+a3+a2+a+1

a6-a5

14.

a—b) a5 —b5 (aa+n3b+a2b2+ab3 +h4

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

16.

a7+2a5+2a4

a4-3a2+2a+1

ах

x2+ax+a2) x2+a2x2+a1 (x2-ax+a2
x2+a2x2+ax3

-ax3 + a1

— ax3 — a2x2 — a3x

17.

x2y2) x1y2+3x2y3—x3y1 (x2+3y—xy2

x4y2

18.

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

15a5-20a1

21a1+2a3

21a*-28a3

4u2 3a3-4a2

30a3-36a2

30a3-40a2

4a2

19.

20.

x—y) x3 — x2y — xy2+y3 (x2—y2

-xy2+y3
— xy2+y3

a+b) a5+b5 (a1—a3b+a2b2-ab3+b1