4(x-3 )²-25( x²-4x+4)=0
4(x-3)²-25(x-2)²=0
[2(x-3)]²-[5(x-2)]²=0
[2(x-3)+5(x-2)][2(x-3)-5(x-2)]=0
(7x-16)(-3x+4)=0
7x-16=0或-3x+4=0
x=16/7或x=4/3