2.8m^2n+2mn =2mn(4m+ 1)

3.a^2x^2y-axy^2 =axy(ax-y)

4.3X^3-3X^2-9X =3X(X^2-X-3)

5.-24x^2y- 12xy^2+28y^3 =4y(7y^2-3xy-6x^2)

6.-4a^3b^3"+6a^2b-2ab=-2ab( 2a^2b^2-3a+ 1)

7.-2x^2- 12xy^2+8xy^3=2x(4y^3-6y^2-x)

8.-3ma^3+6ma^2- 12ma =-3ma(a^2-2a+4)

9. 15ax-20ay =5a(3x-4y)

10.- 16x^4-32x^3+56x^2=-8x^2(2x^2+4x-7)