(x+2)(x+3)=3x+9

问题描述:

(x+2)(x+3)=3x+9

(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