A cura di: Alfredo Bochicchio

$8a^2x^3-a^2-8x^3+1$
$a^2(8x^3-1)-1(8x^3-1)$
$(a^2-1)(8x^3-1)$
$(a+1)(a-1)(2x-1)(4x^2+2x+1)$