If $\alpha, \beta, \gamma $ are roots of equation $x^3-2x^2-1=0$ and $ T_n=\alpha^n+\beta^n+\gamma^n$ then the value of $\dfrac{T_{11}-T_8}{T_{10}}$ is equal to
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If $\alpha, \beta, \gamma $ are roots of equation $x^3-2x^2-1=0$ and $ T_n=\alpha^n+\beta^n+\gamma^n$ then the value of $\dfrac{T_{11}-T_8}{T_{10}}$ is equal to