(x+2)(x+3)=3x+9
问题描述:
(x+2)(x+3)=3x+9
答
(x+2)(x+3)=3x+9
(x+2)(x+3)-3(x+3)=0
(x+2-3)(x+3)=0
(x-1)(x+3)=0
x1=1 x2=-3