Finding The Summation of N term

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I have a Two sequence A and B which are in a serious relationship which is as: enter image description here

where $x = \sqrt{2}$ and $y = \sqrt{3}$

I have to find :

$a_k+b_k$ in general I came with this formula($a_n$ and $b_n$ are known.):

$a_k+b_k = (a_n+yb_n)\times({2}^{4k-2.5})$ where $k>n$

Is the above expression given by me is correct or not