Question

分解因式法：2(x-3)^2=x^2-9

Answer 1

解

2(x-3)^2=x^2-9

2(x-3)^2-(x^2-9)=0

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

(x-3)(2x-6-x-3)=0

即

(x-3)(x-9)=0

∴x=3

或x=9