14(1-m^2)= 14(1-m)(1+m)
3a(1-a^2)=3a(1-a)(1+a)
7x(x^4-y^2)=7x(x^2-y)(x^2+y)
5(x^2y^2-9a^2b^2)= 5(xy-3ab)(xy+3ab)
3(x^2-8xy+16y^2)=3(x-4y)(x-4y)
-3a^2(a^2+4a+4)= -3a(a+2)(a+2)
2(a^3+27b^6)= 2(a+3b^2)(a^2-3ab^2+3b^4)
(x^3-x^2)+(yx^2-yx)=x^2(x-1)+yx(x-1)=(x-1)(x^2+yx)
(a+5b)+(a^2-25b^2)=(a+5b)+(a+5b)(a-5b)=(a+5b)(1+a-5b)
(ac^6-ac^4)-(c^6-c^4)=ac^4(c^2-1)-c^4(c^2-1)=c^4(c^2-1)(a-1)