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b+b2= b(1+b)
x2+x: x(x+1)
3a2-a2= a2(3a-1)
x3-4x4: x3(1-4x)
2y + 2j +3xy + 3xj =
(2y+2j)+(3xy+3xj)=
2(y+j)+3x(y+j)=
(2+3x)(y+j)
20ac + 15bc +4ad + 3bd =
(20ac + 4ad) + (15bc + 3bd) =
4a(5c + d) + 3b(5c + d)=
(4a + 3b)(5c + d)
Espero que te sirva !! Besos.