x⁴-3x²+2=0 x⁴-10x²+9=0
(x²)²-3x²+2=0 Նշ. x²=y
y²-3y+2=0 x2=1 x2=2
y₁=1 x=+-1 x=+-√2
y₂=2
x4-3x²+2=0 x⁴-10×2+9=0
x3+5×2+6x=0 y²-10y+9=0
1:9

1/x-1+4*x+2=3/x