Quadratic Equations

x² \(-\) 6x \(-\) 2 = 0 সমীকরণের বীজদ্বয় \(\alpha\) ও \(\beta\), \(\alpha\) > \(\beta\) । যদি a_n = \(\alpha\)ⁿ \(-\) \(\beta\)ⁿ, n \(\ge\) 1, তবে \({{{a_{10}} - 2{a_8}} \over {2{a_9}}}\) হবে