1)X²-25=0
(x+5)(x-5)=0
x+5=0或x-5=0
x=-5或x=5
(2)(X+1)²=﹙2X-1﹚²
(2x-1)²-(x+1)²=0
(2x-1+x+1)(2x-1-x-1)=0
3x((x-2)=0
∴x=0或x-2=0
∴x=0或x=2
(1)(x-5)(x+5)=0
x=正负5
(2) (X+1)²-﹙2X-1﹚²=0
[x+1-(2x-1)][x+1+(2x-1)]=0
3x(-x+2)=0
x=0或2