(2)x^2+x-2

(3)x^2-3x+2

(4)x^2-x-2

2.( 1)2x^2-3xy-2y^2

(2)2a^3+8ab^2+a^2b^2+4b^4

3. 16b^2+ 16b-48ab-48a

4.m=3

n=-28

5.B

6.D

7.D

8.D

9.B

10.( 1)2a^2+ab-b^2

(2)-0.2a-a^2-0.2-a

(3)4x^2- 12xy+9y^2

(4)- 10x+6

1 1.-2 1

12.B

13.D

14.- 13

15.( 1)x^2+3x+2

x^2+2x-3

⑵(a+b)

(ab)

(3)x^2+(2+m)x+2m

16.m=6

2x^2-3m

17.-3/4

18.a=-2

b=-4

19. 13.5cm^2

20.( 1)3.5

(2) 1/6

(3)2.5x=8.5y+3

2 1.C

22.C

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