解
4(x+3)²=9(x-1)²
4(x+3)²-9(x-1)²=0
[2(x+3)-3(x-1)][2(x+3)+3(x-1)]=0
(2x+6-3x+3)(2x+6+3x-3)=0
(-x+9)(5x+3)=0
∴x=9
或x=-3/5