1.3a＾2-2b-3b＾2+2a
=3(a^2-b^2)+2(a-b)
=(a-b)[3(a+b)+2]
=(a-b)(3a+3b+2)
2.x＾2+(a+b)x+ab
=(x+a)(x+b)
1 a
1 b
3.x＾2-(a-b)x-ab
=(x-a)(x+b)
1 -a
1 b