1. 21a+14b 2. 12ab-b
3. x⁹-x⁴
4. 24m⁶+8m³
5. 18xy⁵+6y
6. (3-x)-4(3-x)
7. 25(a-b)+x(b-a)​

1. 21a+14b=7(3а+2b)

2. 12ab-b=b(12a-1)

3. x⁹-x⁴= x^4(x^5-1)

4. 24m⁶+8m³=8m^3(3m^3+1)

5. 18xy⁵+6y=6y(3xy^4+1)

6. (3-x)-4(3-x)=(3-x)(1-4)=-3(3-x)

7. 25(a-b)+x(b-a)=25(a-b)-x(a-b)=(a-b)(25-x)