(a^2+4)^2-16a^2 can you solve this

Question

(a^2+4)^2-16a^2 can you solve this

Answer 1

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