(x方-1)方+6(1-x方)+9 因式分解

问题描述:

(x方-1)方+6(1-x方)+9 因式分解

(x²-1)+6(1-x²)+9
=(x²-1)-6(x²-1)+9
=(x²-1-3)²
=(x²-4)²
=(x-2)²(x+2)²