因式分解 -3a^2+2a+1

问题描述:

因式分解 -3a^2+2a+1

-3a²+2a+1=-(3a²-2a-1)=-(3a+1)(a-1)
利用十字相乘法

-3a^2+2a+1
=(3a+1)(-a+1)
=-(3a+1)(a-1)

十字相乘
-3 -1
1 -1
-3a²+2a+1=(-3a-1)(a-1)=-(3a+1)(a-1)