楼主,
原式=a+ax+a+ax²+4ax+4a
=ax²+5ax+6a
=a(x²+5x+6)
=a(x+2)(x+3)
按照补充的题是这样:
原式=a+ax+a+ax²+2ax+2a
=ax²+3ax+4a
=a(x²+3x+4)