4x³-2x²-4x²+1=02x²(2x-1)-(4x²-1)=02x²(2x-1)-(2x+1)(2x-1)=0(2x-1)(2x²-2x-1)=02x-1=0,2x²-2x-1=0,x=1/2,x=(1+√3)/2,x=(1-√3)/2