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)