I need help factoring.Please!

Question

1.4x^4-4x^2+1

2.a^4+a^2

Answer 1

1.
let z = x^2
then yo have
4 z^2 - 4 z + 1
(2z-1)(2z-1)
which is (2x^2-1)(2x^2-1)

2.
a^2 (a^2+1)