Question

a的四次方减2a平方加一.求分解因式

Answer 1

a的四次方减2a平方加一
=a^4-2a^2+1
=(a^2)^2-2a^2+1
=(a^2-1)^2
=[(a+1)(a-1)]^2
=(a+1)(a+1)(a-1)(a-1)