问题
解答题
把下列各式分解因式
①x4-y4;
②(x-1)(x+3)+4.
答案
①x4-y4,
=(x2+y2)(x2-y2),
=(x2+y2)(x+y)(x-y).
②(x-1)(x+3)+4,
=x2+2x+1,
=(x+1)2.
把下列各式分解因式
①x4-y4;
②(x-1)(x+3)+4.
①x4-y4,
=(x2+y2)(x2-y2),
=(x2+y2)(x+y)(x-y).
②(x-1)(x+3)+4,
=x2+2x+1,
=(x+1)2.