因式分解:(a+1)^2-4a要有步骤

问题描述:

因式分解:(a+1)^2-4a
要有步骤

原式=a^2+2a+1-4a
=a^2-2a+1
=(a-1)^2

=a²+2a+1-4a
=a²-2a+1
=(a-1)²