(a^2-3)^3-(a-2)(a^2+4)(a+2)

Question

(a^2-3)^3-(a-2)(a^2+4)(a+2)

Answer 1

  (a²-3)³-(a-2)(a²+4)(a+2)=
=a^6-9a^4+27a-27-(a²-4)(a²+4)=
=a^6-9a^4+27a-27-(a^4-16)=
=a^6-9a^4+27a-27-a^4+16=
=a^6-10a^4+27a-11