8a^2+3a-2a^3=a(8a+3-2a^2)
m^2n^2-mn^3=mn^2(m-n)
7x^2y^3-21x^3y^3=7x^2y^3(1-3x)
m*(m+2)-4*(m+2)=(m+2)(m-4)
8a^2+3a-2a^3=a(8a+3-2a^2)
m^2n^2-mn^3=mn^2(m-n)
7x^2y^3-21x^3y^3=7x^2y^3(1-3x)
m*(m+2)-4*(m+2)=(m+2)(m-4)