9(x-1)^2=4(x+1)^2因式分解

题目

9(x-1)^2=4(x+1)^2因式分解

答案

9(x-1)^2=4(x+1)^2

9(x-1)²-4(x+1)²=0

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

(5x-1)(x-5)=0

5x-1=0或x-5=0

x1=1/5   x2=5