1) 3ab+4ac=a(3b+4c);
2) -m^2+2mn-n^2=-(m-n)^2;
3) a^3-2a^2b+ab^2=a(a^2-2ab+b^2)=a(a-b)^2;
4) m^2(m-n)+m(m-n)=(m^2+m)(m-n)=m(m+1)(m-n);
5) x^2-x-12=(x-4)(x+3);
6) 2x^2-x-3=(2x-3)(x+1).
(1)
=3a(b+4c)
(2)
=-(m²-2mn+n²)
=-(m-n)²
(3)
=a(a²-2ab+b²)
=a(a-b)²
(4)
=m(m-n)(m+1
(5)
=(x-4)(x+3)
(6)
=(2x-3)(x+1)
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