因式分解法:9(2x+3)^2-4(2x-5)^2=0

问题描述:

因式分解法:9(2x+3)^2-4(2x-5)^2=0

9(2x+3)^2-4(2x-5)^2=0
[3(2x+3)]^2-[2(2x-5)]^2=0
(6x+9)^2-(4x-10)^2=0
[(6x+9)+(4x-10)][(6x+9)-(4x-10)]=0
(10x-1)(2x+19)=0
x=1/10,x=-19/2