solve the formula method
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3{x^2+1/x^2}-4{x-1/x}-6=0
x^2+1/x^2-2×x×1/x+2×x×1/x
x^2+1/x^2={x-1/x}^2+2
let {x-1/x} = y------(1)
3×{y^2+2}-4y-6=0
3y^2-4y=0
3y^2=4y
3y=4
y=4/3
from eqa(1)
x^2+1/x^2-2×x×1/x+2×x×1/x
x^2+1/x^2={x-1/x}^2+2
let {x-1/x} = y------(1)
3×{y^2+2}-4y-6=0
3y^2-4y=0
3y^2=4y
3y=4
y=4/3
from eqa(1)
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