4x^2=（x-1)^2 x^3-9x=x^2-9
问题描述：
4x^2=（x-1)^2 x^3-9x=x^2-9
2道题目连一起了，我把第2题单独发出来 x^3-9x=x^2-9
答
1.
4x^2=x^2-2x+1
3x^+2x-1=0
(3x-1)(x+1)=0
x=1/3或x=-1
2.
x^3-x^2-9x+9=0
x^2(x-1)-9(x-1)=0
(x-1)(x^2-9)=0
(x-1)(x+3)(x-3)=0
x=1或x=-3或x=3