1)(x³+2x)(x+2)=x(x+2)+(x+3)=(x+1)(x+2)
2)(4x-4y)(xy-y²)=4(x-y)+y(x-y)=(4+y)(x-y)
3)(a²-ab)(bc-ac)=a(a-b)+c(b-a)=(a-c)(a-b)
4)(3a-ab²)+(3b-a²b)=a(3-b)+b(3-b)=(a+b)(3-b)
5)(8a³+8a²b)+(2ab²)=8a(a-b)+2b(a-b)=(8a+2b)(a-b)
6)(3m-3n)+(m²-n²)=3(m-n)+1(m-n)=(3-1)(m-n)