Question

因式分解：(a^2+4b^2)^2-16a^2b^2

Answer 1

(a^2+4b^2)^2-16a^2b^2

=a^4+8a^2b^2+16b^4-16a^2b^2

=a^4-8a^2b^2+16b^4

=(a^2-4b^2)^2

=(a+2b)^2(a-2b)^2