2x7-3ax6-2a2x5 +3a3x1+2a4x3 — 3a3x2 - 4a6x+6a7

8x3+18xy2+ 2xz2-12x2y - 4x2z

12x2y +27y+ 3yz2-18xy2-6xyz-9y2z
4x2z+ 9y2z+ 23

6xyz

6xyz-2xz2-3y22

2x + 3y

4x2+ 6xy
6xy+9y2

4x2+12xy +9y2

29. 3x-2y)3x2 – 11xy+6y2 ( x −3y 30. 4a+b)12a2 — ab - b2 (3a – b

31.

3x2-2xy

12a2+3ab

-4ab-b2

- 4ab-b2

x+7) x3+3x2- 23x+35 (x2 - 4x+5

x3+7x2

- 4x2 - 23x

- 4x2-28x

5 +35

5 +35