4(x+3)^2-9x^2=0
问题描述:
4(x+3)^2-9x^2=0
答
4(x+3)^2-9x^2=0
[2(x+3)]²-(3x)²=0
[2(x+3)+3x][2(x+3)-3x]=0
(5x+3)(6-x)=0
x=-3/5 或 x=6