x²+1/x²+2(x+1/x)=6;
(x⁴+1+2x³+2x)/x²=6;
x⁴+1+2x³+2x=6x²;
x⁴+2x³-6x²+2x+1=0;
(x-1)(x³+3x²-3x-1)=0;
(x-1)²(x²+4x+1)=0;
x₁ =1;
{x²+4x+1=0};
√D=2√3;
x₂ =-2+√3;
x₃ =-2-√3.
x²+1/x²+2(x+1/x)=6;
(x⁴+1+2x³+2x)/x²=6;
x⁴+1+2x³+2x=6x²;
x⁴+2x³-6x²+2x+1=0;
(x-1)(x³+3x²-3x-1)=0;
(x-1)²(x²+4x+1)=0;
x₁ =1;
{x²+4x+1=0};
√D=2√3;
x₂ =-2+√3;
x₃ =-2-√3.