1. (3x^2-2x+1)(3x^2-2x-7)-9=0
2. (2x^2-3x+1)^2=11(2x^2-3x+1)
1. (3x^2-2x+1)(3x^2-2x-7)-9=0
2. (2x^2-3x+1)^2=11(2x^2-3x+1)
1,令3x^2-2x=a
则有:(a+1)(a-7)-9=0
展开a^2-6a-16=o
(a-8)(a+2)=0
把a=8和a=-2分别代入3x^2-2x=a求出x
2令2x^2-3x+1=m
则有:m^2=11m
m=11
即2x^2-3x+1=11
求得x