因式分解:(x2-1)2+6(1-x2)+9.
问题描述:
因式分解:(x2-1)2+6(1-x2)+9.
答
(x2-1)2+6(1-x2)+9
=(x2-1)2-6(x2-1)+9
=(x2-1-3)2
=(x-2)2(x+2)2.