1.
Let α\alpha and β\beta be the roots of equation x2−6x−2=0x^2 - 6x - 2 = 0. If an=αn−βna_n = \alpha^n - \beta^n, ∀n≥1\forall n \ge 1, then the value of a10−2a82a9\frac{a_{10} - 2a_8}{2a_9} is equal to