Question

(x-3)(x+3)=x-3

用因式分解法解这个方程

Answer 1

(x-3)(x+3)=x-3
(x-3)(x+3)-(x-3)=0
(x-3)(x+3-1)=0
(x-3)(x+2)=0
x-3=0
x=3
x+2=0
x=-2

Answer 2

解：﹙x－3﹙﹙x＋3﹚－﹙x－3﹚＝0
﹙x－3﹚﹙x＋2﹚＝0
x1＝3
x2＝﹣2.

Answer 3

方程式可转化为
(x-3)(x+3)-(x-3)=0
(x-3)(x+3-1)=0
(x-3)(x+2)=0
x-3=0或x+2=0
x=3或x=-2

Answer 4

两边同时除以x-3
等于x+3=1
解得x＝－2

Answer 5

x^2-9=x-3
x^2-x-6=0
(x-3)(x+2)=0
x1=3
x2=-2

Answer 6

解:(x-3)(x＋3)-(x-3)=0,(x-3)(x＋3-1)=0,(x-3)(x＋2)=0,所以x=3,或x=-2。