把下列各式分解因式①x 4 -y 4 ;②(x-1)(x+3)+4

把下列各式分解因式①x 4 -y 4 ;②(x-1)(x+3)+4.
2024-12-03 02:34:03
推荐回答(1个)
回答1:

①x 4 -y 4
=(x 2 +y 2 )(x 2 -y 2 ),
=(x 2 +y 2 )(x+y)(x-y).

②(x-1)(x+3)+4,
=x 2 +2x+1,
=(x+1) 2